To those who have spent time boondocking - particularly in the western states - are sources of reasonably clean fresh water readily available in the field? It seems straightforward to process such water using a combination of filtration and a heat regenerative pasteurization system powered by PV. Does anyone collect their water in the field while boondocking? Having to periodically leave camp to purchase and store water seems asinine if not necessary - and seems to defeat the purpose of this lifestyle.