Yeah, you've got to keep an eye on the hydration. A good indicator is the colour of your pee.
If it looks dark like cola, you're severely dehydrated and definitely not drinking enough.
You're aiming for a pale straw colour. On the other hand, if you drink too much late in the evening you're going to be waking up in the middle of the night with a full bladder.
I too made the mistake of not drinking enough when I did the first attempts back in March/April.
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