The white stuff floating in your water bottle are calcium minerals.
Calcium minerals in water can separate from the water, bond together and then precipitate or turn into solid form when the water freezes.
And when the water thaws then the calcium stays in it's solid form and can appear as white pieces or even flakes that float in the water.
For the most part, drinking water with particles in it comes with very few health risks.
For example, white particles in water caused by calcium and magnesium carbonate are safe to drink.
The white stuff floating in your water bottle can also be a result of hard water which is okay to drink as well.
Studies have generally found hard water to have positive effects on the health of its drinkers.
Several studies have reported that calcium and magnesium in drinking water have a dose-dependent protective effect when it comes to cardiovascular disease.
Water described as “hard” contains high amounts of dissolved calcium and magnesium.
Hard water is not a health risk but is a nuisance because of mineral buildup on plumbing fixtures' and poor soap and or detergent performance.
Water is a good solvent and picks up impurities easily.
While most sources of public drinking water are closely regulated and safe to drink, many prefer to drink purified water.
Purified water is relatively safe and may reduce exposure to certain contaminants that can be found in tap water.