Batteries need distilled water or at least clean rain water. I anticipated I would always have the opportunity to
collect some rain water - a gallon or 2 here and there off a plastic tarp or such - and filter it with a coffee filter
to take out any incidental dirt, etc. But if the rain water is polluted with volcanic ash (minerals) I couldn't do that
without a risk of ruining the batteries! So we need to store a lot of distilled
water, or have a distillery.
Offered by Darrell.