I recall the last hosepipe ban and we did the sensible thing and coiled it up and put it in the garage so it wasn't an automatic thing, we still watered any veg in the garden by not using the dishwasher (which does use less) but washing up and put the water on the garden, we would put a bucket under the shower head to catch the water wasted when waiting for the temp to be right, and we disconnected the waste from the bath outside and that went into an old plastic dust bin, we already had a couple of water butts too, nothing died.
We're very frugal in the van too, I filled up at home before setting off, and filled up twice in 4 weeks while away, we do seem to waste a lot but can save a lot by lateral thinking.