While boondocking we'd place a hose inside the garrafon attached to a 12 v. electric pump (a backup for the motor home's water system) and the output hosed to a kitchen sprayer, pump's wiring to our 6 volt battery bank clamped on for 12 v. Sprayer went inside the shower tent. Garrafon needed to be in the sun for the first part of the afternoon, but after 4 pm in wintertime, it became too cold, but otherwise fabulous! after a swim around the coral. Daily useage was generally three garrafons per day for us, one just for the two showers. Miss that beach.