Touch-up from Automotive Paint

[truckster]

I've finished assembling my Blazer's front clip, and there are just a few spots where I need to fix a little damage. Is there a way to use automotive paint to make a touch-up paint? I realize I can mix up a tiny batch in the regular proportions, but is there a way to make a small batch that could be kept in a sealed bottle and used whenever it's needed?

Thanks!