something that we used to do years ago in parties, that might work with your bottle thing..

We used to get a pint glass, swill it out with cold water, empty the glass and put it in the freezer for 15 minutes. When you take it out, get your joint and put the cherry end in an empty pen, and blow back down the other end into the glass. The smoke will come out of the roach like you're taking a toke, and will go into the glass. Because the glass is so cold, the smoke will all settle in the glass and stay there. You can sip it like a drink, and you'll get nice and high!

In theory, the same might work in a thermous flask.. It'll stay cold. Not a bad idea actually. I might have to buy me a flask! :smokin: