since you're immediately giving half (or whatever amount) of it away, and those people will doubtless consume it quickly, and the remainder is a very small amount, I probably would use plain beer bottles and caps in this case too.
I bought some of those clear 6.3oz bottles that take a regular crown cap for the purpose of giving out samples to people whom I'm not sure will like it. Also useful for testing carb in young bottle conditioned beers without wasting too much of the precious.
cheers--
--Michael