The jelly/Jello in TFA is glue, gelatin is the same thing as hide glue and you can use grocery store gelatin the same way as you use hot hide glue. All the sugar and flavorings added to jelly/Jello would affect its properties as a glue but it should still work as a glue; set time will be slower and the bond weaker but I suspect it will work.

Edit: so if you want to glue it to something the easiest way is to just heat up what ever you want to glue it to high enough that it will just barely melt the surface of the block of Jello. Next easiest would be to use hot hide glue,it will reactivate the gelatin in the Jello and bond well to it and will be able to glue it to anything that hide glue will stick to.