Based on their diet the last couple of weeks - which was the best you knew how - they are likely deficient in a number of things, like protein and vitamins.
Please get them some good feed - at this point, even some sprouted wheat and ten percent of their food crushed dry cat kibble - temporarily, anyway till you get poultry or waterfowl starter. Pet stores carry mealworms. Some amaranth or millet soaked overnight would also provide more nutrients. Again, till you can get a regular feed.
Some folks get crickets and put them in an empty kiddy pool and let the ducklings eat the crickets.
They need protein, they need vitamins. I would not wait till I had the perfect food to start giving them more nutrients. I would start immediately.
Please get them some good feed - at this point, even some sprouted wheat and ten percent of their food crushed dry cat kibble - temporarily, anyway till you get poultry or waterfowl starter. Pet stores carry mealworms. Some amaranth or millet soaked overnight would also provide more nutrients. Again, till you can get a regular feed.
Some folks get crickets and put them in an empty kiddy pool and let the ducklings eat the crickets.
They need protein, they need vitamins. I would not wait till I had the perfect food to start giving them more nutrients. I would start immediately.