temperatures

thinking 2 of my girls are sick, temperature at 78-80f {26-27c} lights on, 68-70f {20-21c} lights off with a 45-50% humidity. Last time they was watered was 3 days ago, last feeding was on the 4th Formula 2: Bud/Bloom 2-4 weeks depending on light and water consumption the soil is still moist not...

Hey dudes was hoping someone could shine some light on me. I want to know how can I keep my water temps down ? Without spending 600$ on a chiller for a few buckets I got going . I've heard of the frozen water bottle or ice pack idea . Any ideas guys ? Much appreciated sincerely BaKed lol