- 1
Run 1/2 cup warm tap water into a measuring cup. To truly ensure accuracy, you can use a candy thermometer to check the temperature of the water. The temperature should be 110-115 degrees Fahrenheit. - 2
Stir in 1 teaspoon sugar and two teaspoons yeast (or one packet of yeast). You will see three almost equal levels: the bottom third with sugar and yeast, the middle third with cloudy water, and the top third with a film of yeast. - 3
At 5 minutes
If foam and bubbles form within 10 minutes, then the yeast is still active (alive). The mixture will be approximately half milky looking water and half foam.
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