Late getting back here, I concur with above advice. I often use a cactus mix with added grit as MsDoe described. It might seem like the water is just running through, but perlite and pumice in particular actually store water in their little air pockets and retain enough to sustain the plant while still allowing plenty of oxygen into the soil.
If your media is adequately low peat and free draining, it's virtually impossible to overwater. I can fully saturate these two plants weekly with no risk of rot...or leave them 2-3 weeks.
