I called, spoke with 4 different people - up the chain so to speak, as the first 3 had no idea if it would be safe to mix in anything other than water with Daconil. The 4th person said "NO!" to mixing any chemical other than water and even recommended waiting at least 3 days before spraying anything else on the plants. Micheal was most emphatic about both those things.
So, no to the mixing other things in with the Daconil ( other than water, which actually is a chemical it's self).
I would suggest a LOT of caution in using Daconil after I read the info at the link here, too. Daconil is some serious stuff.
https://en.wikipedia.org/wiki/Chlorothalonil