It all depends what sort of exercise you are planning and what your current state of training is.
If you gone on SS and want to start training in addition, it's not really recommended for the first couple of weeks.
If you have been training before, you are ok to go on with it, just take it, as your energy allows you to.
I have been training as before (even slightly more), but I only did a strict SS for 2 weeks and then started building my intake around the weight training. I have not had a problem at all.
Everybody is different, so you need to balance it out.
More water, yes, definitely. More packs, not really, but you could time your packs around the training, like have one short before for some more energy, or split one for before and after.
Good luck