Post #767619 by AceExplorer on Fri, Aug 19, 2016 7:26 AM

I just re-read the first post in this thread. Thermos bottles ARE well-insulated, so I don't think you'll have any problem using a Thermos. Couple extra thoughts if I were to do this:

1. Fruit juices are easy to rinse out. Anything with a fatty ingredient like Coco Lopez requires soap solution to clean it when you're done. I never put fatty stuff into anything which is hard to clean, like flasks.
2. The longer you have the ice in your thermos the more dilution you'll get. With a well-insulated Thermos you should be fine for a few hours, however it will eventually water down the drink. I would expect 3-4 really good hours with less acceptable dilution after that amount of time has passed. Of course, start with as-cold-as-possible liquid before you add the ice.
3. Thermoses (Thermosii?) sometimes have a small mouth, and this can be a problem with ice going in and out of the bottle.

Let us know how it goes, how well your container worked, and how quickly you drank all 750ml.

Cheers!