Ice in your water, or room temperature like a civilised person?

Room temperature is the way. Hydration shouldn't be a shock to your teeth.

If you need ice to drink water you're basically just drinking ice that melts.

Cold water hits different in summer. Can't imagine sipping lukewarm tap water.

Room temp is actually better for digestion and doesn't shock your system. But I get why people like the chill.

Ice obviously. This isn't even a question.