Nekton is an excellent product. They have a variety , depending for everyday nekton-S, Nekton Bio while molting, also for different birds Nekton-Lori and the Nekton MSA is minerals and calcium with D-3 in it. I have used their product since the l980ties. You can use it in the drinking water, but it is better in the soft food diet. My birds are on the Bean Diet and twice a week they get one of the Nekton Supplements in there.
The beauty of this product is that it doesn`t really go outdated as in bad, but rather after the "best before date" the product is still usable, you just need a bit more of it and the taste may not be as fruity.