Don't really use stoves that much, could...
Don't really use stoves that much, could I use this as a water bottle? You know, human fuel?
No, no, no, no, NEVER, EVER mix your (toxic) fuel containers with your drinkable water containers! Even if you are using a brand-new bottle, it's best to keep Fuel bottles as fuel bottles, water bottles as water bottles and pee bottles as pee bottles (just so someone you are camping with doesn't accidentally take a swig of something they didn't intend to)!
No! As another person posted earlier, never mix your water bottles & fuel bottles. You never want to be confused as to which is which. The bottle even with no fuel has a distinct smell that you would not want to drink from.