You'll need 1 cup of water per 1 cup of brown rice for the Instant Pot. Less liquid is needed because much less evaporation occurs when rice is cooked in the pressure cooker than on the stove top. This Instant Pot brown rice recipe includes 1 1/4 cups water per 1 cup of brown rice for a softer, fluffier texture. If you like a chewier texture, use 1 cup of water.