I was given the same info from my MCHN.

Have you tried giving your bub a bit of a tummy massage when he seems to have some discomfort? Might just help everything move along a bit more easily for the poor little man.
Thats what I would try. It may be wind.
Its extremly unlikely that you baby would be constipated if full breastfer, up to 11 days can be not unusual and not constipated.

There is no need to give your breastfed baby water, just feed more often if you think bub is thirsty - you drink the extra water.