Hi,
For trips of more than a few months:
50L in tank.
20L Jerry full.
10L Jerry full.
Use from tank, topping up from 10L Jerry.
When empty, fill from 20L and top up 20L when possible at parks etc.
Top all water when buying fuel - check it is potable in dry areas or by muddy river towns.
Some towns have two water supplies, one is NOT for drinking.
Only ever run out once - both Jerries were empty, and the sink tap got pushed open on a rough road. (Always turn the pump power off along with the gas).
Cheers
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