We have 50 gallons of fresh water under one of the benches, and that isn't enough for the two of us. Plus a small dog and cat~! So, installed a Valterra ABS 38 gallon tank on the front bulkhead, bought on Amazon. Have a 230v water pump from previous owner, and can transfer from that tank to the in-house tank. Fittings are poorly thought-out at the moment, this summer, a more robust system will get installed. Here's a pic of the final install, minus the final fittings install~!