Keeping hydrated

I spent most of last night getting up and going to the toilet. I still made it into work but it was clear that I wasn't going to be in any way productive so I was sent home where I then spent the day in bed. My limbs are aching, my head is sore and my back is agony. According to NHS 24 I just need to keep myself hydrated, I'm sure that just means when I go to the toilet it will continue to be like water...