Add water, oil, and salt to the rice. Here's the secret to cooking perfect Instant Pot rice: use a 1:1.25 ratio of cups of rice to cups of water. That means, if you're using 1.5 cups of rice, you'll mix just shy of 2 cups water into your cooker with the rice. (The ratio doesn't have to be perfectly measured, you can kind of round and guesstimate).