We'll I would say the more the weed you consume the higher you will get. How will you get high? It is probably dependent on how much THC is in your weed. Just add enough for a good dose, just what you feel comfortable with. It might be better to drink it on a light stomach though cause if you got lots of food in your stomach it may take longer for body to absorb and digest. You'll probably be hungrier after you are stoned anyway.