@Sarah233 Where I live there is not water rationing per se (i.e. gallons per person, nor do we have water meters) but water delivery is not constant. The town water line out to my place is only opened 2 or 3 times a week, during the night. This fills my water storage tanks, capacity about 800 gallons, so I have to be quite conservative with water. The whole town operates like this- no one gets constant water coming down the line.
I only host 1 guest at a time, so that helps as far as water usage. But when guests arrive, I'm quite clear about the need to conserve water.
No need to flush the toilet every time you pee- if it's yellow, let it mellow.
Do not leave water running when brushing teeth or washing dishes.
5-10 minute showers, max. No need to turn the water off when soaping up, nor jump in and out in 2 minutes, but if you take a 20 minute shower today, you might not have any water to shower tomorrow.
Hang up wet towels over the outside railing (it's almost always sunny here) so they dry quickly and stay fresh smelling.
Guests get 2 bath towels, 1 hand towel, and 1 wash cloth per week. If they're here for 10 days, I'll give them fresh ones at the halfway mark, 5 days.
Because I have a rural listing, I tend to get guests who are environmentally and ecologically aware people anyway, so none of my guests have balked at this program, ignored it, nor given me a bad review because of it. Many say they do much the same at home, even though they have may have no water restrictions where they live.
If your whole area is water restricted, it's not like your guests will be able to book another place in Cambria (I've been there- it's lovely) where they can be wanton with water usage. You could state prominently near the top of your listing "Please be aware that ALL of Cambria is on water restrictions. Conservative use of water is a must. "
And I myself make sure as much water as possible does double duty. Floor washing water gets used to water the potted plants, and my grey water lines all pipe out to various areas of the garden (I built my house from scratch, so this was incorporated). When I have a shower, I have a pail in there which I place to catch as much shower water as possible. I don't indisciminately throw clothes I've worn once into the laundry basket. Towels get hung up to dry after showers so they don't end up getting funky and needing to be washed so often.