Re: Juice in the base or...
If you use liquor, only a shot or two is more than enough. More than that you may risk making yourself very sick. Remember - hookahs can vaporize what's in the water - if there is alcohol than you are going to be breathing liquor in with your smoke. Also - careful driving afterwards - you may have it in your system even if you never drank any.
OJ and Cranberry juice is great, some flavored teas are good too. I like to add vanilla extract to the base - mellows out harsher flavors.