I did some research on preservatives. I found lots of info but none that are practical to buy for small batch stuff. Then I found a few mentions of "grapefruit seed extract". It seems it can be used as a preservative for short term things. With it, I think I will be safe keeping a batch in the bathroom for a few weeks without refrigeration. Longer and I would probably need a professional grade preservative. I found a bottle in a health food store.

More information found here: http://www.care2.com/channels/solutions/self/120 and here: http://www.makingcosmetics.com/store...target=d3.html
Chin length 3A Prodcuts: Burt's Bees More Moisture Shampoo/Conditioner; All in One Spray ; searching for ideal styling products