Filtered water or Spring water
In a 2 quart jar place wheat berries and fill the jar with water. Cover the jar with a cheesecloth, nylon mesh screen or I used a stainless steal sprouting screen, I got it here (you can see it in the picture below). Let wheat soak for 10-15 hours. Drain off water (do not rinse the wheat) lay jar on counter and let the wheat sprout for 2 days. After this time, cover the sprouts with about 6 cups of water and leave at room temperature for 24 hours. This water is your Rejuvelac, pour it off into another container, it is best to drink at room temperature but it will keep for 2-3 days covered in the refrigerator. It should be yellowish, cloudy and tart, with some bubbles/foam on top and a little bit of a yeasty smell. If it become too sour or slightly carbonated it may be starting to be a bit unfriendly and you probably shouldn't drink it. Just watch it on really warm days it may take less then 24 hours.Immediately refill your jar of sprouts with 6 more cups of water and soak at room temperature again for another 24 hours. The sprouted wheat can be used this way a total of 3 times then the wheat is great to feed birds, to add to your garden or to your compost pile.
Rejuvelac can be prepared using wheat, rye, quinoa, oats, barley, millet, buckwheat, rice and other types of grain. Best results have been found using wheat, rye, and quinoa.
By the way if you don't have a 2 quart jar you can easily use two 1 quart jars and just use 1/4 cup of wheat and 3 cups of water per jar.