To make due means to make the best use of whatever is provided, even if it's not ideal, and that's what they're doing by using warm milk and watered-down oatmeal.
Context: "Infant formula and cereal would be ideal, but we can work with some warm milk and watered-down oatmeal."
Hypothesis: Infant formula and cereal would be ideal, but we can make due with some warm milk and watered-down oatmeal.
Based on the context, is the hypothesis true, false, or unknown?