Failing to keep my cool

Congratulations London Underground on your brilliant posters advising "customers" to stay cool in the soupy 38 degree rainforest atmosphere that prevails on your hermetically-sealed, un-air-conditioned "transport" "system".

"Why not carry a bottle of water with you?" they say.

Genius.

Are there machines on the underground selling such bottles?

No.

Think on, London Underground. Think on.