Yesterday I thought it would be fun to put tiny dots of food coloring in an ice cube tray and let my son pour water into it.
He’s now able to control the little water pitcher enough to pour into individual ice reservoirs.
I put single dots of blue, green, yellow, and red, and I also doubled some dots up (red-yellow, blue-red, etc) to make different shades when the water hit them.
The colors mixed together as the water hit them, but continued to deepen as the minutes passed.
When the water was all poured, I gave him a paintbrush and scrap paper to “paint” on.
Total entertainment value: about 15 minutes. It would be more if you re-colored the ice cube trays and got more water. It made pretty water, though!