It was Victor Hugo Pena. He was in yellow at the ends of stages 4-6 in 2003. Anyone who has read this site for a while knows I'm pretty mercyless wehn people inflate the virtues of Lance. As I see it he never dominated a TDF. (Try 52 and 69 for comparison). He is the only 5 time TDF winner to not have a double. (actually all the rest have 2 doubles). I could go on and on.
BUT
Neither he nor team management sent Pena back for water.