On the leftwing my pic there's a liquid calcium (plus D3)., then a liquid multivitamin, then a powder calcium (plus D3), then last on the right is a powder multivitamin. I obviously use the liquid ones in the water, the powder gets sprinkled on solid food.
As the fussy eaters tend not to eat anything which has been powdered I just use the liquid supplements for them. The ones which will eat anything get the powder on the food, but also the supplement in water because they all get water from the same bottle when I do a water change.