what you gotta do bro is make a gravity bong, all you need is your old slide, a 2 liter, and a Hawaiian punch bottle. cut off 3 of the bottom tips of the 2 liter, melt a hole into the 2 liter cap and stick that slide of yours into it (make sure its air tight) then cut the top of the punch bottle off but make sure you cut it so the 2 liter can fit tightly and move up and down in it without falling (its a pain in the ass to hand a grav hit to your friend when the bottle is falling that is why i prefer the hawaiian punch bottle instead of a pitcher) then fill it up with water to the 5th line of the hawaiian punch bottle, pack your cap with some good buds, (only a pinch needed for each hit, PACK HITS SEPERATELY so you dont waste weed, this will also help on getting everything out of it you can for the price you get it for) light the lighter to the cap and slowly pull the bottle up, (do so until the bottle is almost out of the water but make sure it doesnt completely come out) unscrew the cap and blow out allllll of the air from your lungs (your gonna need the all the space in your lungs that you can get for this monstrous hit) then put your mouth to the bottle breathe in the smoke and the bottle will naturally start to pull down just move with it and when it gets to the bottom it will start to bubble (if it doesnt bubble and you get water in your mouth that means you have too much water) so dump a little water out if so nd find the right amount you need so that it will bubble
i love the grav i smoke out of it every day, fuck wasting weed that is still burning in a bowl or a blunt while your not hitting it, with the grav you dont waste any smoke it all goes into the bottle that you will hit because you only pack enough weed for each hit and its not sitting there burning away while youre exhaling or passing, greatest invention ever, if this didnt explain good enough on how to make it feel free to ask any other questions or just go look on youtube im sure they have good vids on how to make it