I cannot drink water or liquids if I have bad nausea. Although it's only happened a few times, I have actually vomited water. I often feel like dry food is easier to digest than water (one of the reasons I prefer not to use drinks like Ensure to gain weight). But when the nausea passes, I can drink as much as usual. In addition, the less solid food I eat, the less thirsty I am, and the more nauseated liquids like water make me feel. More solid food sometimes makes me a little more thirsty.Many factors are involved in water needs. People who have a very low weight (like me) may not need as much. Also to be considered are medications, humidity levels, diet and nutrition, and any special health conditions.