I use hot water & must in a 50:50 ratio, with a good pinch each of yeast nutrient, yeast energizer & D.A.P. Though simply following the rehydration directions on the yeast packet works fine too. I suppose one could do both. There are some who swear by rehydrating with Go-Ferm & water only. I can see advantages (at least as percieved by me) to all of these techniques & I may use them all at some point, but I've had good luck so far with my methods, so I'll probably stick with them until such time that something causes me to alter that. Regards, GF.