Over the years ,here where we live, there have been a couple of water issues . First a power cut back in Winter 1990,so five days without ( melted snow then!) then a burst pipe,same decade. It was a standpipe to supply us for a good 24 hours then. After the first gig,we went to the chemist over the road and always kept purifying tablets. Now we have filters too. I’ve used them successfully on my overnight river trips fishing. Water is heavy,so the filter is good.
Anyhow,I am sure most here have such equipment,so that’s not an issue. The real question is this; Do you have your OWN alternative water source?
We carry 100 litre emergency water. We have a well ( rather good too) and my water butt system which is hundreds ++ litres. And the brook over the road. I’d still prefer Severn Trent pushing it into the pipes though!