Water usually gets in down the seat tube and pools around the BB, it just happened to go up the downtube when you flipped the bike.
If its a conversion, there's probably a screw hole for the cable guide you could open up to let it drain.
I had this problem once, when I used to lock my bike outside. I was curious and started to wonder why, so I observed it for a couple of days. Seems my neighbor's Great Dane had developed a habit of urinating on my bicycle everyday when my neighbor took his dog for a walk.
...or at least have a rough estimate of how much leaked out, just so you know how much to put back.
Personally, I recommend pedro's track water, even on conversions, it does the trick. Campy used to have some offerings, but have since discontinued their whole line, check ebay from time to time tho, every once and a while a vile of pure Italian track h2o will pop up.
Originally Posted by Santaria
because physics has more street cred than tarckstars.