I imagine hot water may be good. Solubility increases with temperature, so the SN would dissolve quicker and better -- as Anhaedra stated. Not too hot to prevent you from drinking the full amount, but maybe the temperature of a cup of tea that has cooled somewhat.
This is purely speculative but I've also read that drinking hot beverages helps to increase your body temperature, which usually happens during digestion and will signal to your body that you are full. I assume this may cause your body to divert more blood to your digestive tract, which would increase digestion and absorption rate. However again this is pure speculation and I have no evidence to verify it.