After cruising extensively with and without a water maker , admittedly 2 years in the Pacific with chn was pre watermakers, I would not go without now. Maybe for a few weeks but when living on board for months/years at a time comforts are important. The boat was home we weren't on a camping holiday. With chn it is important to have healthy food and water, and have enough water per day as Jon says, for drinking. Dehydration can be a real issue in hot climates. A few times when away with our chn in the Pacific we got really low with water but thankfully rain arrived but that doesnt always happen