Place your grains and lentils in a bowl and cover with water. Let sit for at least 8 hours or overnight.
Strain the grains and lentils. Rinse in a fine-mesh strainer, pick out and discard any sand or debris. Place the rinsed grains and lentils in the inner pot of your Instant Pot. Add the rest of the ingredients including the 2 cups of fresh water.
Lock the lid into place, making sure the nozzle is in the sealing position. Use the Manual (or Pressure Cooking) mode and set the timer for 13 minutes.
When time is up, use the natural release. After all the pressure is out of the pot, remove the lid and stir.
Remove the pot and allow it to cool completely before transferring to a container and storing in your fridge.