Equal parts Elmer's Classic glitter glue & liquid starch. For "Goop," use Elmer's white glue instead of glitter glue and a few drops of food coloring. Whenever it gets sticky, just add a smidge more liquid starch.
Probably the biggest hit at the party ! Jell-O shots in syringes ! Just buy some regular liquid tip syringes or luer lock style (both work) I used both. The sizes of syringes I used where and we only filled the to just so they were eq