I mix my own lube out of chain saw bar and chain lube and mineral spirits. I keep/dispense it from an old 3in1 oil can.
I have a small Visine eyedrop applicator that I sometimes put into my seatbag just to have some lube along for the ride. I never need it, because I'm careful about lubing my chain, but sometimes on my rides, I'll encounter other riders with squeaky chains (yikes!), and I always offer to lube them up.