Can drinking water from a bottle put your health at risk?

Drinking water is extremely essential for the human body's functioning. However, there is often a problem that lies not in the water itself, but in the bottle. While there are materials authorized for food contact, some compounds can migrate into drinks. There is also a risk associated with reusable bottles used without proper cleaning, as they can accumulate microbial contamination. A study on bottles mentioned contamination both inside and out, demonstrating that the problem varies depending on the material, frequency of refilling, type of drink, and cleaning habits.

What are the dangerous risks of using the wrong bottles?

Bottles can be harmful when used for coffee, tea, juices, or sugary drinks and then only rinsed with water. A bottle should always be suitable for the intended use/beverage and maintained with the necessary hygiene and materials. Bottles that contain coffee, tea, or soft drinks show greater contamination than those that only hold water, because they leave behind harder-to-remove residues and nutrients that favor microbial growth.
Regarding the chemical side, not all food-contact materials are the same, and some may release substances into the contents, such as microplastics and chemicals present in these materials. These can affect health, product composition, and even taste or smell. Therefore, one can conclude that it is important to be wary of cheap, old, poorly identified bottles or those with degraded interiors. The wrong bottle poses an endocrine, reproductive, immune, neurological, cardiovascular, and renal risk. The real risk always depends on the substance, dosage, frequency of exposure, heat, and the condition of the bottle. Microplastics: the risk isn't just the particle itself. The WHO divides the concern into three fronts: the particle itself, the chemicals it may contain or transport, and the microorganisms present in biofilms.

What else can be released from poor-quality or inadequate bottles?

The names that appear most in this conversation are bisphenols, phthalates, antimony, and, in some metal containers or defective coatings, metal ions. The problem is that a cheap bottle can fail not just in the plastic itself, but also in the additives, the cap, the seal, the internal lining, or the quality of the metal.
BPA is a health concern for consumers of all ages, causing potentially harmful effects on the immune system. It is present in reusable containers and other food-contact materials. “BPA-free” is not always the solution. BPS is classified as toxic to reproduction, and a group evaluation identified more than 30 bisphenols in need of restriction due to their hormonal or reproductive potential. Therefore, removing BPA and replacing it with another bisphenol from the same family is not always a real improvement.
PET, typical of disposable bottles, brings another concern: antimony. Several studies and reviews show that antimony can migrate into water and that heat and storage time increase this release. In many tests, the values remain below regulatory limits, but the pattern repeats: the more heat, the greater the migration. Leaving bottles in the sun or inside a car does not help.
Phthalate is also worth mentioning when this type of compound is present in plastic components. The regulatory concern here is primarily for endocrine disruption and reproductive toxicity. Metals are another issue: the European guideline for metallic materials clearly states that ions released by metal materials can affect health; and if there is lead, there are harmful effects, with impacts on children's brains, kidneys, blood pressure, cardiovascular system, and pregnancy.

Stainless Steel Bottles?

The main problem with stainless steel bottles is that over time, or even if the product quality is lower, corrosion often appears, leading to a damaged interior and the subsequent release of harmful micro-particles, such as metal ions like nickel, chromium, and iron.

What to consider when choosing a bottle?

The following points are crucial when choosing/caring for a bottle:
Hygiene;
Materials;
Bottle quality.

Ceramic interior coating

A ceramic interior coating in a bottle, even if it is a thermal one, is one of the most appropriate options. It does not cause health damage and provides the following advantages:
More neutral taste. Ceramic tends to have less of a metallic tang and less flavor transfer between drinks. This is one of the reasons why this type of interior appears frequently in cups and bottles designed for coffee, wine, and beverages with more sensitive aromas.
Fewer stains and less odor retention. Coffee, tea, wine, and acidic drinks tend to stain a well-applied ceramic surface less than exposed metal. Several brands highlight precisely its stain resistance and ease of cleaning.
Extra barrier between the drink and the metal. In food-contact materials, direct contact with metal can become more relevant when the drink is acidic or salty, as this can increase the migration of certain metal ions. An internal coating serves specifically to reduce this direct contact.
Smoother surface when drinking and washing. In products of this type, ceramic usually provides a smoother, less dry feeling in the mouth, with an interior less prone to trapping residues.

So what are the right choices?

If the priority is health, ease of cleaning, and daily use, the most suitable material options are: glass and ceramic. Glass is non-porous, easy to clean, and makes it easy to see dirt. In the study on reusable bottles, glass bottles showed the lowest readings of organic residue on the outside, precisely because they are easier to clean and easier to inspect by eye. The only downside is their increased fragility and they are usually less practical for transport.

Runbott Bottles

In terms of technical features, the Runbott stands out for its EverTaste ceramic interior coating, designed to preserve the original flavor of the drink and prevent the transfer of tastes and odors. The brand also presents its products as BPA and phthalate-free, which reinforces the idea of daily use intended for safe contact with drinks. Some models with straws also come with a brush suitable for cleaning them, thus maintaining the possibility of hygiene and health safety.
Another strong point is the variety of formats and capacities. Within the Runbott range, there are more compact models for coffee, tea, or quick daily use, such as the Cup Mii and Siip in 350 ml, and there are also Mii bottles in 600 ml, 750 ml, and 1 liter, allowing for a better choice between portability and capacity.
In practice, these are bottles that are easy to use and easy to clean. The brand itself mentions simple and long-lasting cleaning thanks to the ceramic finish, which helps a lot with frequent use with water, coffee, tea, or other drinks that tend to leave a residual smell or taste. In models with a sports cap, Runbott also mentions an integrated straw, foldable mouthpiece, and SnapLock system for a more secure closure.
Regarding thermal performance, there are differences depending on the model. The Mii 35 offers cold retention for up to 24 hours and hot for 12 hours; the Mii 60 and Mii 75 reach up to 32 hours cold and 24 hours hot; the Mii 1L lasts up to 36 hours for both cold and hot. The Cup Mii offers 24 hours cold and 12 hours hot, while the Siip was designed for shorter periods, up to 10 hours cold and 8 hours hot. In other words, there are options for quick routines, for work, for training, and for full days away from home.
They are not fragile bottles either. The Runbott has a non-slip base for greater stability and protection against drops and impacts, and also has an exterior finish with powder coating designed to better resist wear and maintain the appearance of the bottle for longer.
Caring for your body today is an investment in your well-being tomorrow.
— Aveimédica