I'm about 188 cm (6'2") tall and weigh about 86 kg (190 lbs, 13.5 stone). I need about 1 liter of water per hour. Less and I get both grumpy and crampy.
Cheers!
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2008 Red Co-Motion Speedster Co-pilot (Redster)
2009 Surly LHT (captain's commuter)
2009 Surly Crosscheck (stoker's road bike)
2007 Giant FCR2W (stoker's commuter)
1980's NOS Legnano (stoker's toy)
1970's Stella rebuilt as fixed-gear (captain's toy)