3/4” glass drill bit from amazon for $8 or $9.
I’ve wanted to make one of these since high school, and if you’re on the fence, just get a drill and bit. They’re useful to have around and you can get a corded drill for $20. There just isn’t another good way or safe way to get holes in glass.
Flyshop 3/4 Inch Diamond Coated Drill Bit Make Lighted Bottles Glass Blocks https://www.amazon.com/dp/B00UYVO0B0/ref=cm_sw_r_cp_api_i_wKybCb8D2PCYT
YOU CAN DO THIS!! All you need is: a drill 3/4 diamond drillbit (for glass) link Grommets for connecting down stem to bottle link Lastly downstems of different sizes.
You can simply buy a ship in a bottle or any other bottle to make as many bongs as you want. I personally make bongs out of any glass bottle I have lying around. Plus when they get dirty take out the Down stem and recycle it. 10/10 Recommend
I bought it off Amazon. It was 8 dollars, I can link it once I get to a computer. And I put it in the highest speed.
Edit: Here is the link