The tutorial is over at ThisLittlePiggy at this link. I think Dianna posted it.
These are easy enough for some kids to make.
The recipe is a Martha Stewart version and the tutorial includes that link in the post. In the recipe, when it calls for a "pipette" to drop the food coloring, I imagine you could use a simple medicine dropper. At the recipe site, it shows yet another way to shape the fizzies and/or present them.
Some men also love this soothing touch to a bath. When using epsom salts, it is especially comforting. It only requires the right colors.
This is part of my series (1/15-2/14) of Valentine projects.
For other projects in this series, just look along the right sidebar for the label "Valentine Projects." I will post only tips that do not require knitting, crocheting, machine sewing, tatting, embroidery, or any other skilled technique.
If you are feeling lazy, check my Etsy shop for items for your gift list.