hey.
Here's my first ever homemade bong. (pics attached)
Materials:
Gatorade 'Propel' Bottle
Middle piece/tube of a ballpoint pen
Glass funnel from Chemistry lab
Glue Gun
Basically what I did was melt a hole in the side of the bottle with a glue gun, using a lighter to heat up the plastic, but not burn through.
I then inserted the pen tube in the hole at about a 45 degree angle (I should have put it at a high angle but o well)
Next, I sealed 'er up with a pile of glue ;)
The great thing is that the glass funnels from the chem lab fit perfectly into the pen tube, and create a nice seal on its own. It can be drawn through the cap or without it.
Nice and portable too.
I tested it out and it works great. enjoy.