How did you extract the thc? It sounds like you may have just added unprocessed plant material which would do nothing other than waste it and make the beer taste awful. I think carbonizing and extracting with alcohol would be the method to use but even then I imagine that it would only be good in a modest dose in a strong flavored beer.
yup, cannabis in a water tea does nothing. very high strength alcohol is the most reliable way to extract THC and other relevant substances in regtards to beer. (you could use oil perhaps? outside of my experience)
this would also help you in measuring dosage, especially if you bought it. in canada, you can buy weed AFAIK (i don't use it) with labeled variety, THC content, etc.
Personally, I always hated ingesting weed in ways other than smoking, as it is slow to act and then hits you like a ton of bricks and not in a good way.