It's important to drink but also be aware too much water can also dehydrate you as it flushes all the nutrients out.
The first 10 days I was drinking a st marks solution.
You can make it yourself with water glucose, sodium chloride and sodium bicarbonate.
It doesn't taste good but you can drink as much as you like and it will hydrate you
http://www.gloshospitals.nhs.u...eaflets/GHPI0247.pdf