Far as water goes......gotta know your viruses for water and pathogens in your area. Myself personally for field use I've got an epa certified water filter/ purifier that removes viruses but to extend the life of the filter which is I think 264 gallons I prefilfer with a 100% silk clothe for fine sediment...treat with a solution (I only do this with a filter that does not remove viruses). My backup is a bottle of 100% pure crystalized iodine and a three stage straw filter regulated at like a thousand liters.
U can sun bake water for purification and boil as well..lengthy processes but if you have time I'drecommend it to save your equipment for pinches
Gravity filters are great if you have the time...no pumping...very simple and no moving parts to break or replace but again if you're on the move it depends.
Cross contaminating while filtering is something to be weary of otherwise you've done all that work for nothing
If you ddo a bladder or reservoir you can get an inline filter that will filter the water pumped right through your hose to your bladder...the katadyn does this pretty well in conjunction with the filter like a sawyer but these aren't regulated for viruses... Just the other nasty stuff
Hope this helps
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