Step 1.) Remove kona kava from packaging
Step 2.) Place directly into trash
Step 3.) Purchase some excellent kava from any vendors mentioned by krunkedout.
Order at least 1kg (2.2 lb) because you may need to work through your reverse tolerance. You may be one of those divinely blessed people who feel it 100% at the first attempt. If that is the case, congratulations. If not you're gonna have to work to achieve the magical effects from kava.
As for weight it will depend loosely on the type of kava you buy. I can tell you that 1/2 cup weighs around 55-60 grams. Going by this method 1kg will usually yield (for me) around 16-20 of my usual one cup killers.
Recipe: Heat 1 3/4 cups of water in microwave for 1 minute 10 seconds or until around 110-120. Soak 1/2 cup kava (I use stone kava from nakamal @ home) in 1 3/4 cups of water for half an hour. Knead kava in strainer (I use 3 strainers from nakamal @ home) for 20 minutes. Wring it out well. Refrigerate for a few hours, then drink. Again, this is my recipe which yields about 12-14oz of seriously bitter, extremely strong kava.