Is that an electrolyte solution? Be sure not to overdo it. I would probably offer plain water alongside. Mostly they need cool water, shade and plenty of breeze.
It only makes a quart. I made somet took it out to them they all drank some and I could see a immediate improvement. I offer ice water, regular Warmish tap water a wading pan and a fan. The heat is sweltering, ice starts melting as I'm walking it to the barn.
Yes the one with the yellow container. I let them drink the quart then give them fresh water. I can't ever remember it being this hot so many days in a row.