Hi Dottie,
At least 1.5 liter of water per day...
I had mine infused at a rate of 200 cc over 4 hours, the normal cure is fifteen 200 cc bottles. At that rate, 3 bottles a day, you're in for 5 days..After the first couple of bottles, if everything is ok, they can increase the infusion rate to 1.5 hour per bottle.
I never head any headache and I never took any medication against it, but iVIg didn't work for me, I had two without any effect...
Maurice.