Avoid any product called "kava tea". It's not tea and can't be drunk like tea. Kavalactones aren't water soluble so simply steeping a teabag filled with powdered kava root in water won't do anything.

Head over to /r/kava and the read the FAQ in the sidebar which includes a list of recommended vendors (and which ones to avoid).

If you want to get high, by the bulk kava powder from Amazon, but it tastes absolutely terrible.

For day to day use try the Yogi Tea with kava in it. It has cardamom so actually tastes good. The dose is very low so you’d need 3+ teabags to feel anything.

I’ve had extracts that didn’t do much. Pills of the powder have helped. The biggest experience I had was with the full on blending of the powder in a blender following a YouTube recipe video-wakacon from amazon.