Um, there is a thread about natural preservatives on that bulliten board I posted the link to. It should be in the same forum.www.brambleberry.com
also has lotion making supplies, I don't know where you are...uumm..you can pm me your location if you want and I can try and find someone near you..a pharmacy won't have it.
If you just make small amounts and keep it in the fridge it should be fine. But I wouldn't sell it or give it to people without a preservative or making sure they know to refridgerate.
If you are making something without water it is much less likely to have bacteria problems, it is the water in lotions that can cause problems.