you might wanna redo that "really nice bowl" plastic doesnt make a good bowl, well that is if you vlue your lungs, throat and brain.

i will be very suprised if you can get a hole in that bottle without cracking it, ive made 100+ glass bongs and ive never been able to make one that had a spherical surface.

get a diamond drill bit and go veeerrryy sllloooowww