So, in theory, one could drill a small hole in the top of any pump bottle, seal off the side hole and potential stick it on the driptip and press. I found some little 1.5 ml spray bottles that should fit in my PCC I have coming. I carry a tiny purse and wear tight pants, so carrying anything more than one bottle turns into a rather awkward operation. Where do y'all get that teeny tubing? I'm thinking a 1/8" -1/4" piece of that might make it a little more secure for inserting in the driptip...