Per Attila Iskander:
Keep your eyes peeled for the metal 1-2 quart premix bottles
They are sturdy, close well and are easily refilled

This may be an indication that I have more money than common sense, but
I'm getting close to pulling the trigger on one of these:
http://tinyurl.com/c4qffmy and two more if it works out.
--
Pete Cresswell