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chiroshi
You can get something absurd like 300-litres'-worth of water purification things on eBay for £5, I think one of the brands is "Oasis". They weigh nothing and you can take loads of them. Bonus, you'll be sorted if they shut the water off after Brexit and we're all forced to drink out of muddy puddles.
Watch out for heavy metals and that sort of thing, the filters and purification things just kill bacteria and viruses. If you're near old mines or whatever (there's a fair few in Wales) just be a bit careful about what you drink. (Same goes for boiling)
But yeah you'll be totally fine drinking from most streams.