I thought OP was talking about a seasonal site.
If we have hook-ups, we attach the hose when we arrive and leave the water on the entire time. We do use a pressure regulator.
The water heater is turned on the the morning for showers and dishes, then turned off until supper dishes. I do not leave it on as it is gas only and is really loud.
When we leave the sticks and bricks the water is left on. If we are going to be gone more than a week, we shut off the water heater. Someone is by each day to feed pets, water plants etc.