DayZ field wiki · Survive
Water bottle
Plastic still counts
Short answer
A PET bottle is a well you can carry. Same rule: fill it where the water is safe.
Also: pet bottle · plastic bottle
How it works
Bottles spawn more often than canteens. Empty soda bottles can become water bottles. Inspect before you sip.
What to do
Keep one filled. Boil or tablet if the source was stupid.
Don't
Don't chug an unknown bottle.