Place the wheat berries/quinoa into a glass jar and cover with water overnight. Don't seal the jar, just cover it loosely with a paper towel of cloth.
The next day, drain the jar and rinse the grains with some fresh water. Drain it from the jar and cover the jar loosely as before but tip the jar on its side. Lay it on a kitchen bench near a window, if it is very hot, you might want to move it out of direct sunlight, but I did this on some hot hot days and the sun does speed up the process.
Throughout the next 2-3 days roll the jar around so that the grains are not always wet and have plenty of room to sprout. (See video)
When the sprouts have reached 1/2 inch or more in length, fill the jar with filtered water and make sure the sprouts are all covered with water.
Seal the jar and leave at room temperature for up to 3 days. I found I had good activity after just one day.
Once you are confident you have good bubbles and lots of activity in the rejuvelac it is ready to use.
Drain out the liquid and store separately in an airtight jar in the fridge. Use as directed in recipes or add 1-2 tbsp to smoothies for a great probiotic boost to your day.