Mix black cherry or raspberry gelatin with corn syrup.

Add water to create the desired consistency.
(If you do not have the gelatin, use several drops of
red food coloring to one drop of blue coloring.)

Transfer the mixture into empty water bottles
with squirt tops and apply as needed.

This product is safe to ingest

If you want to make it "more washable" to get it out
of clothes, you can add some dish soap to the brew.
CAUTION: This will render your blood supply
NON-ingestible. So DON'T STICK IT IN YOUR MOUTH!