No-Rinse Body Gel or Saltwater Soap
Using a dish washing detergent for personal hygiene at sea is really extreme! A dish washing detergent like Joy will remove your body oils and really dry out your skin, I'm surprised that you didn't develop skin rashes on your sailing trip. If you want to conserve water you could use a "No-Rinse" body washing gel made especially for personal hygiene and will not dry out your skin. The "No-Rinse" body washing gel is the same product the astronauts use in space. All you do is add a little water and lather up and then use a towel to wipe off the residue. All the dirt and grim is now on the towel. You can use the dish washing detergent, Joy, to wash the towel in saltwater to clean it and re-use the towel. Another product to conserve water is call "Aqua Lather Saltwater Soap" which can lather in saltwater. The "Aqua Lather Saltwater Soap" is pH balance and is marketed for personal hygiene use, you lather using saltwater and rinse once using saltwater and then use a sponge and a bucket of fresh water to wipe off the saltwater residue on your body. All of these products can be found in most outdoor camping supply stores or you can go on-line to www.REI.com.80 gallons for 7 days for 6 people is pushing it. Most of your fresh water should be used for drinking, personal hygiene (sponge baths) and washing cooking utensils (first wash in sea water and then use a sponge with fresh water to wipe off the salt residue) for a long sea trip where you can't replenish your fresh water supply. Use disposable baby wipes or bath wipes, pre-moisten bath wipes you can find in drugstores or healthcare stores, to clean hands, face and for a quick waterless wipe down instead of fresh water. You should have an emergency water container separate from your fresh water tank to be used as emergency drinking water to get you to the nearest port in case your fresh water tank becomes contaminated or you lose all your fresh water in the tank.Fair Winds.Clyde