tap water.......FREE

[Mortblanc]

5 days and you never stop for fuel, food, go through a weigh station, or sleep at a place that has a faucet on the outside of the building ???

Would that mean that you also go 5 days without a wash up, poop or pee?

Might be you should think about filling up one here and another there rather than emptying them all and asking if you can fill the entire batch.

Over here we have "truck stops" (I don't know what you call them in the UK) with fuel, food, showers, lounges and even small sleeping cubicles (heavy restrictions on how long one can drive without a nap). The waitresses in those truck stops will fill a coffee urn, water carrier or thermos for you for free and slip it to you. After all, you were going to leave them a good tip anyway, weren't you?

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BTW, how are you going to find water SHTF if you can't figure these things out now?