I wouldn't put it in their drinking water, they likely won't drink it---the taste isn't something they like. They'll end up ignoring the water altogether, which isn't what you want. I suggest making a couple more waterers as well.
That's what I do. I put in some greens; kale, peas, high-interest treats and then a bit of the liquid b complex and a bunch of water. Works like a harm.
For ducklings I'm really worried about, I'll soak a couple mealworms in the b complex and feed it by hand to make sure they're getting...
I have three cayuga ducklings, about 6 weeks old. They are on Nutrena chick starter/grower with Flock Raiser and rolled oats mixed in. They also get kale, peas, other veggies daily and an our or so outside daily (it's crazy hot and humid in MA right now). I'm planning to buy a bag of the new...
"A few common brands found at most feed stores and online are Durvet High-Level B complex, Aspen VITA-JEC B Complex, Vitamin B Complex "Generic Brand", and Vitamin B Complex HP by Vet One Brand, the price is fairly low and ranges from ten to twenty dollars which will last for many years."
I'm...