I know there is a theory about flushing the chemo out but I am not sure how accurate this is. The main point is not to become dehydrated. Drinking to the point of nausea is not necessarily helpful as you lose fluid if you are actually sick! Your urine colour is a good indicator of hydration (light and clear is good, dark is not). Remember that many foods contain fluid too. Sucking ice blocks may be another option, especially as the weather warms. Certainly go for pleasant flavours ( sugar free preferably). Good luck.