Some good ideas man. Some of mine. Canteens have 2 drinks in them before they need filled up again. Cans of juice give u 50 blood back too. Tins of food give u 250 blood If yer water bottle is flashing red eating a tin of beans or sardines will give u 5 mins before it start flashing again, Cuz if u were that thirsty u would drink the bean juice and sardine oil,I know i would.