DOMINIC KIRUI  FOR 50 years, Ester Yokoi has been drinking water from Kenya's Lake Baringo, and for 50 years it has been poisoning her. Yokoi is one of several thousand villagers to develop a bone-weakening disease due to the lake's dangerously high fluoride levels, officials said, leaving her unable to walk and too poor to afford medication, or even safe drinking water. "I still drink the same water from the lake... What do you do when you're thirsty?" said Yokoi, 50, who lost the use of her legs 30 years ago. Nowadays, the mother-of-six drags herself along the ground to…