[moffkalast]

Why hot water specifically? That sounds like the worst kind of lemonade.

[nicoburns]

Think of it like a lemon tea. You can in fact get lemon flavoured tea (e.g. lemon and ginger).

[nerdponx]

It's actually very nice and refreshing. I've done this too at times for unrelated reasons. It feels "healthy".

[heavyset_go]

In my experience, it isn't perceived as bitter/sour as it feels in cold water.