I'm starting a garden and want to prioritize crops I can grow for food in case of supply chain issues in future. Can you help me choose some plant species that will:

 - Provide enough caloric/nutrient content for two adults
 - Can survive in Hardiness zone 9-10
 - Can either grow in clay-heavy soil or in containers
 - Can survive short periods of frost
 - Minimizes water requirements
 - Crops have roughly 1/3 acre of shallow hillside to grow on, facing northeast
Depending on the specific conditions of your garden, there are a few plant species that may fit your criteria.

For a hardiness zone 9-10, you may want to consider planting potatoes, cabbage, squash, kale, carrots, tomatoes, peppers, and radishes. These crops are known for their hardiness and their ability to tolerate a wide range of temperatures and soil types.

Potatoes and squash are both relatively high in calories, and can be grown from a single seed in clay-heavy soil or in containers. Carrots, kale, and radishes are also good sources of nutrients and can be grown in clay soil.

Tomatoes and peppers can be grown in containers or in clay-heavy soil, and they will survive short periods of frost. However, they need a lot of sun and water, so you may want to consider planting them in an area with more sunlight or supplementing them with irrigation.

Finally, you may want to consider planting fruit trees. Fruit trees can provide a good source of calories and nutrients, and they can often survive cold temperatures and clay-heavy soil. However, they require plenty of sunlight and water to thrive, so you may want to consider planting them in a sunnier area or supplementing them with irrigation.
What specific type of fruit tree were you thinking?
Depending on the specific conditions of your garden, you may want to consider planting apple, pear, plum, peach, or cherry trees. All of these fruit trees can provide a good source of calories and nutrients, and they can often survive cold temperatures and clay-heavy soil. However, they require plenty of sunlight and water to thrive, so you may want to consider planting them in a sunnier area or supplementing them with irrigation.