In the Wild cattails from bullrushes make good food

The cattails will be one of the things we will require to survive. It has many uses. The top part that is brown can be broken open in fall and the fluff or pollen is great tinder for starting fires. It can also be used as down to stuff in your jacket to keep you warm. The root is like a potato and can be dug up even into winter and cooked like a potato. The stock contains a starch which when beaten in cold water will produce a flour like powder which can be used to make bread.

Cattails or bullrushes are wetland plants, typically 1 to 7 m tall ( T. minima is smaller: 0.5-1 m ) , with spongy, strap-like leaves and starchy, creeping stems ( rhizomes ) . The leaves are alternate and mostly basal to a simple, jointless stem that eventually bears the flowers. The rhizomes spread horizontally beneath the surface of muddy ground to start new upright growth, and the spread of cattails is an important part of the process of open water bodies being converted to vegetated marshland and eventually dry land.
Check out the survival facts on how they intend to go about it.

The cattail is one of the most important and common wild foods
You can easily recognize a cattail stand: White, dense, furry, cigar-shaped overwintered seed heads stand atop very long, stout stalks, even as the young shoots first emerge in early spring.