Generally with instant kava you just put some in your glass, pour in water or juice, and stir. No time requirements, strainers, etc. A little warm water works the best to dissolve the mixture.
The instructions say 1/4 tsp. per serving, which I find kind of weak, so I usually go with at least 1 tsp. The Hawaiian is the most palatable, effects are comparable to Fire Island. The Fiju and Vanuatu have a pungent, earthy odor/taste that I think I'm going to have to get used to. I usually drink kava straight with no mixer, so I might need to try a fruit juice.