Filtering water does not necessarily make it safe to drink. You may need to purify or treat the water before drinking. There are many methods of purification, and it would be a good idea to have various options available to you. You should study out which method would be best for you.
Water 2: Filtering and Sanitizing Emergency Water
How to purify and filter water making it safe to drink
How to Safely Store and Use Pool Shock for Emergency Water
Be informed about the chemicals you add to purify your water. Boiling water is the recommended method of purifying water but when you cannot boil water you need other options. Learn how to store and handle these chemicals safely.
Emergency Disinfection of Drinking Water (epa.gov)
ATSDR Calcium Hypochlorite and Sodium Hypochlorite ToxFAQs (cdc.gov)
Calcium Hypochlorite: 5 Health Hazards and Safety Tips (camachem.com)
Drinking Water and Health: Volume 2 (nih.gov)
Public Health Statement for Chlorine Dioxide and Chlorite (cdc.gov)