Dave, I am going to politely disagree with you on this.
Therapeutic treatments (which electrolytes are not, really) should not be diluted by offering plain water, that reduces the dosage the bird gets, and therefore reduces their effectiveness. Things like de-wormers and antibiotics, given in water, should always be offered without access to other water, to ensure the birds all get an adequate dose to deal with the issue at hand.
Electrolytes are not what I would term a treatment for an existing condition, they are rather more a preventative thing, like a vitamin. I don't have any packages of antibiotics at hand right now (upstairs in my office) but I would venture to guess the package for most will say something like "make this the only water available for X number of days."
And ACV, being used as a treatment in this instance, IMO should not be diluted. It won't harm the other birds, and if the affected birds don't get an adequate amount, it won't be effective.
CEDavid, yes, Buckeye eggs should be brown. Shellless eggs however will not have pigment.
Have you had any birds showing any signs of illness of late? As BuffaloGal says, there are several poultry illnesses which can cause problems with eggs, which might include a loss of pigmentation.