You can save water at your faucet or shower head without giving up washing power by using an aerator. This site explains the benefits and points to you to commercial sources.
Several models of water bags you hang above you for a shower. Can be used on deck, or above the head's deck hatch.
Concentrated soap that works in salt and fresh water. For hair, body, clothes, dishes. Biodegradable.
Brief grab bag of tips and commentary on using the shower and keeping it and its plumbing clean. Contains excerpts from hard-to-find bulletin board and newsgroup postings, as well as links to useful sites and vendor pages.
Bags for sailing gear, made from recycled sailcloth. Duffels, backpacks,