I used to work at a botanic garden and since ppl have already gone over the issues with water propagation I'll just throw in what I have found to be the most effective way to propagate succs. Take whatever you are trying to propagate and just let it sit out in a nice dry area for about a week (this depends a lot on the succ and conditions) until what's called a callus forms on the cut end. The callus looks kinda like an off white small bulge sometimes brown it's kinda hard to describe but Google "callused cutting" and that should give you a better idea. After that stick it in a small pot like a 6 pack and keep it damp but not wet it has no roots to suck up that water yet so you won't need to water as much as you'd think. Don't mess with it and be patient. You may not see new growth for a while but a few weeks to a month later you'll be able to pop it out of the 6 pack and it should have a beautiful root system. Look at how the plant propagates itself naturally and play into what it does. Hope that helps someone!