Let's imagine I'm hiking and I find a water source - like a lake, a stream or a well, and I want to fill my water bottle with it.
I have a bottle and a water filter. And a bandana. Since I can't tell if the water I see is safe, I want to filter it prior to drinking. But - how should I proceed? I see 3 options here:
- Filter the water right away, when filling the bottle. This way I'm sure the water inside the bottle is safe for drinking.
- Or fill the bottle with (possibly contaminated) water and filter it before drinking. This allows me to have my filter last a bit longer (as some water from my bottle could be used for purposes that don't require a clean water...)
- Or, maybe, have a bottle with the filter in the drinking cap (or drinking straw), so if I want the clean water - I can sip it from there and if I need "just" water, I can pour it from the bottle directly (note: I got no idea if there are any good bottles with good filters/drinking straws like that).
Before filling my bottle I can pre-filter the whole water via bandana, of course, to get rid of floating particles and maybe let the UV from the Sun do some job on killing bacteria.
What would be your approach? Assuming the filter won't last forever.