Excerpt from:
www.cdc.gov/healthywater/emergency/making-water-safe.html

Bring the clear water to a rolling boil for 1 minute (at elevations above 6,500 feet, boil for three minutes).

Excerpt from:
www.artofmanliness.com/articles/hydration-for-the-apocalypse-how-to-store-water-for-long-term-emergencies

Water Barrels. If you have the space and you're looking to have at least one month of water storage on hand, you can't go wrong with 55-gallon water barrels. They're made from sturdy food-grade plastic and have bungs at the top that can be sealed super tight in order to protect your water from contamination. The plastic is also BPA-free and UV-resistant. Two of these babies will give a family of four about 27 days worth of water. This is what I have right now for my water storage solution.

Excerpt from:
www.instructables.com/id/DIY-Water-FIlter

The materials that I used in the filter were pretty easy to find and most of them relatively cheap. The most expensive material that I used was the activated carbon but it's also a key part of the filter.

Fine/Play Sand: I found this at my local Home Depot but it can be found in other places, the first place you should look is your local home improvement store. I paid $3.98 for a 50 lb bag

Gravel/Pebbles: I also found this at my local Home Depot and it can be found at any home improvement store. It can be obtained from outside but you will have to make sure that they're cleaned very well in order for them to work and not just taint the water you're trying to filter. I paid $4.38 for the pebbles.

Activated Carbon: I obtained this at my local pet store in the fish area. this was the most expensive material on the list costing $15.

Excerpt from:
www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/bpa/faq-20058331

Some research has shown that BPA can seep into food or beverages from containers that are made with BPA. Exposure to BPA is a concern because of possible health effects of BPA on the brain and prostate gland of fetuses, infants and children. It can also affect children's behavior. Additional research suggests a possible link between BPA and increased blood pressure.

However, the U.S. Food and Drug Administration (FDA) has said that BPA is safe at the very low levels that occur in some foods. This assessment is based on review of hundreds of studies. The FDA continues to monitor the research.