Thanks for the heads up re big bottles. I was thinking about 2 L foldable bottles. I am looking at modifying some non hennessy tarps I am getting to be able to use these HH2O's. Where I live the nearest river is 10 miles away and the ground is very permeable so little run off except in a flash flood. So I would need to take all my water on a trek with me. It also makes a good back up water system if necessary.
As I am planning a week long trip to a desert island with no rivers or springs so the only fresh water would be what I can collect off the tarp or carry in. It is fortunately in a tropical area so rain is plentiful. So again would need to carry in a lot of water if I did not use the tarp for water collection.
Apart from making some pre-filters for HH2O's I will be filtering and boiling the water.
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