So could the water be evaporated to recover the drugs? I'm assuming yes, but surely there will be other water soluble a present that were also in the smoke....
I don't know about drinking though since the dosage/concentration would be completely unknown.
Ok.
Get epsom salts and bake them in the oven until they go white. Do this on foil. Not too high an oven. Doesnt take long.
When cooled chuck a helf handful in a bottle of acetone. Shake. Let the salts drift to the bottom. This removes all the water in the acetone.
Next: get bong water. Put in wide flat pyrex dish. Put on top of a halogen lightbulb desk lamp or similar very low heat source. Put a low fan on. Leave until bong water evaporates and you are left with the dried up remains of yummy tummy meth.
Scrape off the goodness on to a little dish which is also glass. Dont use metal.
Get a coffee filter and position it over a wine glass. Put the goodness in the filter
Drip the acetone over the goodness so it soaks into it and dissolves out the crap and impurties. Drip by drip as too much is a pain in the arse and takes too long.
Your meth will be nice and clean once again to smoke but onv wait till the acetone evaporates and its as dry as a nun's nasty. Acetone is flammable.
It wont be very pretty and will possibly still have a few impurities so could leave makes in the bong piece but its cleanable.
Do not iv this. Its smokable but ive never shot up reconstituted gear. Its not worth the risk.
Havrnt used a water bong in years. If you are using one to get rid of the chaff in gear its easier to just use a normal boring pipe and puddle the gear on a v low flame and blow out the initial smoke gently as the chopper burns first or if sharing a bowl get your mate to go first as they will cop it and not you and you will appear really generous too ha ha