Airtight-ness - While it is always a good thing to have an airtight piece, if you can manage to get enough air to dilute but not too much to loose suction then your hits will be excellent.

Drilling glass - mason bits are said to work if you cant afford the diamond ones. if you dont have any of that shit than start with a very small bit and drill very very slowly. I've been able to drill through but its really tricky and not worth breaking a kick-ass bottle.
CocaoAtros420 Reviewed by CocaoAtros420 on . What am i breathing? Bongsmith's Basics All right fools, time for some handy bong building tips for all you bongsmiths so feel free to add any info. Remember you shouldnt have to breath in anything more toxic than your smoke. Harm reduction not discrimination! Section .01: Materials 1. Choose wisely and dont be impatient. Building bongs is like building puzzles; not all pieces fit. 2. NO TOXIC SHIT! Do not use any thing that gives off a strong scent/odor even if it is more pleasant than the taste of the smoke. Also NEVER Rating: 5