A pipe would probably be better, since all you have to do is break it up, and stick it in there. And as for how much..fill the "bowl" part up most of the way, and once you're done smoking that, see how you feel. It should be sufficient if it's good quality.

As for the pills, sell them to highschool students. Or if you're feeling ethical, give them back to the doctor. Hehe.

Hope I answered your questions, good luck with the change in meds.