Seems to be more noticeable the more empty your stomach is. My lab rat becomes ravenous if pinned on an empty stomach.
Getting the stomach filled with a tall glass of water seems to help if you are trying to stay fasted after the shot.
I am sure Dat would be the guy to ask on this, but I don't think that drinking a bunch of water to deal with the hunger would hinder the benefits of being fasted after your ghrp/mod GRF(1-29) shot.
The following Psyllium Seed Husk Fiber Powder based product. It is ground real fine and with the Apple Pectin it forms a nice gel that curbs hunger and slows digestion.
I can make a big chocolate chip cookie have a low GI type of impact on blood glucose with this. Just take it with water before a meal or when you want your stomach to not be so hungry.
It is available at most brick & mortar vitamin shops.