The bucket and hose is in the shade, so it doesn't get super hot. I have a water spigot with a 4-way splitter, allowing me to have both waterers on their own hose, but still allowing me to have a hose seperate for spraying down the yard ar washing my hands. I was surprised this weekend when I turned on the seperate hose, and the water was rather cool. The temps were about 95 this weekend in Sacramento.
The first one I made was utelizing an orange, 5 gallon, Home Depot bucket in the full sun. After 3 months or so I poured out the water and wiped down the sides, then let it refill. It did have some algae, but only the small amount you would see in a fish tank, it wasn't growing thick and wavy. I thought about how to reduce the algae growth, but I was more worried about chemicals and having the chooks drink them than wiping down the bucket. The newest waterer is white, and I will check on algae growth as the time passes.