Where to find water whilst travelling?

[Tonks]

All water coming through pipes is potable in the uk, the question is if its a very rarely used tap how long has that water been in that particular bit of pipework, your choice if you use it.
We have found morrisons petrol stations good for an outside tap and im led to believe all motorway service stations have too supply water somewhere on the forecourt.

No it isn't. A stop I am regularly at has several taps on their site which are marked as not being potable. They do have other taps which are fine to use for drinking water.

 

[Scottish Scrutineer]

Cemeteries pay for their water. If you're going to take from their supply it is only right and courteous to ask first. Lots would probably be happy for you to take a 10l container's worth but might be less keen on your filling a 100l tank. Also, bear in mind that lots of church/cemeteries pipes are decades old so may contain lead...

I’ve never know of a metered water supply in any of our cemeteries, and few supplies other than some commercial users, another difference difference in Scotland

 

[Tonks]

My van has a 60l underslung water tank, but I also carry a 10l inboard tank which has been much easier to fill when travelling than the underslung tank. On some trips I've also taken a smaller 5l container, and I've never been refused when I've asked if I can fill it, because it's not a huge volume but it's enough for me to tide me over until I can get more. The 5l container is discrete enough in size that I've taken it into cafes and farm shops to ask if I can fill it. I always offer to pay, but I've always been a paying customer and so far I've never been asked to pay any extra for 5 or 10 litres of water.