If you want to go food grade from top to bottom, go to a homebrew supply store. They have bigass funnels for filling carboys (the big glass bottles like they used to put on water coolers) and usually a couple different widths of food grade vinyl tubing. You're still going to need to hit the hardware store for the hose clamp, but that's going to be a buck or less. Done this way, the beer won't taste any different at the bottom of the bong than it does at the top (if you keep it clean).
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