There is a cold process method which I think is called CPOP; with this method, you do cold process as usual, then put your mold into the oven for a time to ensure a gel, but this isn't a true hot process method. I do oven hot process, and my mold never goes into the oven. With hot process, your soap is cooked completely before you mold it. While you don't get as smooth a product as with cp, it does have some benefits. You color and scent at the end of the cook, when all the lye is neutralized, so you don't have as much trouble with colors and fragrances morphing, and also not as much risk of acceleration. Also, less scent may be required, and the soap is ready for use sooner. I would not recommend a water discount with this method, though; the soap "batter" would be too thick to be workable. If you watch it closely and only cook the minimum time necessary, the soap will still be mostly pourable; you can't get the really beautiful swirls like with cp, but you can still get a very pretty bar.