One could not binge drink when extremely dehydrated, or else it would endanger the body. The water didn't look very clean as Queenie had deliberately sullied it a little. Jacob had to take some time to blow the floating insoluble away before taking a sip.
However, she had done it as she thought that it would help Jacob avoid gulping the water down too fast. Otherwise, he would only hurt himself.
Jacob thought it was a bit redundant of her to do that because he already knew he couldn't binge drink. However, he was touched by Queenie's thoughtfulness.
After having drunk more than half a glass of water, Jacob felt refreshed. Although his mouth still felt a little parched, he set the rest of the water aside. He let himself settle for a while as the Howran Qi in his body slowly flowed, dispersing the water he just drank to all parts of his body.
A few moments later, he felt much more energised.