Great idea to freeze it, except that it would take hours for it to defrost. I used to work for a Major airline and know they bring in a ton of profits from thier inflight sales.
This whole thing plays/falls right into thier hands, all the time hiding under the shield of "It's for your protection" I can already see the price of bottled water going up. As for me I am a beer drinker, so I expect that to go up as well. We are, after all, are a captive audience, after that door shuts for the last time.....If you wany to drink you have three options. Drink nothing, order a drink and pay your fine, or go to the lav, and make a small cup out of your hand. The last not being a very good idea IMHO.