I doubt if Jelly Babies will disolve. Just out of curiousity this evening I thought I'd see if dextrose or glucose tablets would disolve so I popped one of each into a glass of warm water and even after an hour they hadn't disolved :-(
Bless you, that is so kind of you to try for me! Truly, thank you. My murdered jelly babies got thrown out () will try them again, alongside Haribos and Candy Kittens.
What about syrup or thin honey? If you keep it in small bottles to take along with you you'll always have it on hand, and it will easily go through the tube. You'll only need very little too!