There are a couple of BBQ restaurants that I frequent. They have these little plastic cups used for sauces (with tops, but you won't need the tops). I take about 40 or so each time I go. Epoxy is mixed in these with 5 cent plastic hobby paint brushes I get at a local hardware store. The end which mixes depends on how I need to apply. If I need to coat something, I use the brush end, if not, the handle.

BTW, careful with 5 minute, I've noticed that it gets pretty hot when mixed. I don't use 5 minute for anything other than fuelproofing now (thinned either with heat or denatured alcohol, both of which increase curing time). I've found that it's not as strong as 15 and 30 minute epoxy to hold 2 parts together. This is especially true if you're trying to save weight by using as little glue as possible.