Polluted water may contain a number of chemicals that inhibit Ca²⁺ATPase. throughout the body including in the brain, and heart.
The ideal solution is a reverse osmosis filter for drinking and cooking.
A carbon filter is a start. With sink installed variants being more effective than pitchers.
Avoid bottled water.
Use stainless steel bottles without a plastic liner.
Have stainless steel bottles that are a different color for each family member.