I'd spread & rake in seeds for moist soils (like rushes, milkweed, ironweed, iris, joe pye weed, sedges, et cetera) within 10 feet of the shoreline, and native prarie grasses above that. Then I'd put a straw erosion control blanket over all of it and use a portable trash pump to spray water over the whole thing. The erosion control blanket will hold the seeds & soil in place, prevent birds from eating all the seeds, and hold the moisture in, which greatly aids germination and development. FYI, you're going to have a hard time growing anything without being able to water it. I wouldn't go through the trouble and expense of seeding if you are not able to water it when needed.
I would recommend Prairie Nursery for seeds. Check them out at:
www.prairienursery.com
