Native edible pond or water garden.

Good morning folks! I wanna throw out some names for my possible pond garden and those are wild rice, if my water's shallow, American lotus, cattail, sweet flag, blueberry, cranberry, native watercress, water lily, sunchoke type sunflowers, and few others to resemble the ones indigenous folks had years ago. How we grow wild rice in our backyards as long as our water is shallow and free from contamination? Any more wild edible plants that have more protein and vitimins? Please share me some ideas with me so I could help feed people and draw wildlife at the same time. Have a good day!

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Have you considered Wapato (Sagittaria latifolia)? As well as a good starchy food, according to Sagittaria latifolia, it has quite good quantities of B vitamins, also  iron, manganese phosphorus and potassium.

I've considered building a pond with edible plants, but some plants are too large to fit in a small area. How could I fit the arrowhead or other large rooted plants into a small pond? How we make our small ponds produce more food with high nutritious content, protein and vitimins without the plants choking one another out?

I recall Dani Tippmann saying that wild rice needs seasonal changes in water level, so it might be a difficult crop for a small pond, and the wild oats which she found in Indiana require flowing water.

Have you thought about American Lotus? It is supposed be edible (tubers and seeds), though I have not tried it myself. Missouri Dept of Conservation on American Lotus

Anybody tried cattail before for stews and stuff? Wanna find out what it tastes like. Anymore better plants to cook for stir fry? I'm looking for something similar to spinach, kale, cabbage and things like that. Could watercress do the trick?

Pennywort is another one.

https://www.ediblewildfood.com/pennywort.aspx I guess it’s the one referred to as dollar weed.

Watercress is similar to spinach. It’s tastier in my opinion, but more stem and smaller leaves.

Are you aware of floating pot plants for edible crops such as spinach, parsley etc.?
Floating pot plants