The latter - just giving it at night , may eork out. I hope we can hear from someone hetter experienced with balancing antibiotics and supplements. Perhaps @casportpony
I need to turn in - will check in the morning
Can you give the antibiotic in water overnight, then switch to water with calcium in the morning, and plain water in the afternoon? Do you like how I come up with all this extra work for you? Just thinking out loud -
She may be okay in that department. I hesitate to use antibiotics too much. And at the same time, with ducks, we may not notice problems till they are advanced. But if she's breathing okay, still, you say she's wobbly.
Worst case she could have egg yolk peritonitis. It is a systemic...
I am not sure they are recommended to be mixed together, actually.
Sometimes healthy ducks have a little water drippy from their nares off and on - how is her breathing?
She may be. Do yo have any apple cider vinegar? I might put a teaspoon of that in a pint of water to see if she'll take it. It is said to be a tonic. Or, poultry vitamins? A little immune system boost. Inside is a help - she won't have to try to stay warm, that will preserve her energies.
It depends on where you live. I found mine at the local drugstore - capsules, open them up and sprinkle into the water. I reckon you could find it at a big box grocery store, pharmacy, GNC, places that sell supplements.