In 4-cup microwavable measuring cup, stir Bisquick mix, salt and cream of tartar until mixed. In liquid measuring cup, mix water and food color.
Stir a small amount of colored water at a time into dry mixture until all water is added. Microwave uncovered on High 1 minute. Scrape mixture from side of cup and stir. Microwave uncovered 2 to 3 minutes longer, stirring every minute, until mixture almost forms a ball. Let dough stand uncovered about 3 minutes.
Remove dough from measuring cup, using spoon. Knead dough in your hands or on the counter about 1 minute or until smooth. (If dough is sticky, add 1 to 2 tablespoons Bisquick mix.) Cool about 15 minutes.
Use dough to make fun shapes. Store in tightly covered container in refrigerator up to 30 days. Dough is not edible.