I read that 8 wk old chicks need probiotics in their main water supply. So they’ve been outside in the coup and run for about 6 days, still haven’t figured out the yellow toggle in the cup, although I go out periodically during the day to show them. They do drink the water in the cup, but don’t tap to get the water. I’m concerned that the probiotic water might get stale. The weather has ranged from high 40s - 70s. Any ideas?