If you are buying a premade base you need to get a liquid suspension soap base. Or you can find one and check the list of ingredients for what they use to make it a suspension liquid soap. Just remember if you are buying any premade base and start adding ingredients it could change the integrity of the base. Always check to see what % of additives you may use. This is why buying a premade suspension liquid soap base may be a better choice as its already been formulated. Many bases allow you to incorporate anywhere from 2-5% in additives without changing it.