switch to glass gravities, you wont regret it!
I used a metal bowl for 2 years and it brought back my asthma.
Here is what I use to give you an idea.
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The bottle you can drill a hole near the bottom.
If you don't have a diamond drill bit, your local head shop can drill a hole for you (as long as it's never been used).
However, I found my bottle at a headshop with the hole already in it.
I cannot find the bottles with a hole online.