Welcome to the forum lifepivoting, and congratulations on finally getting your medication . Usually there aren’t any problems with US customs, I guess you’re one of the few unlucky ones. Drinking plenty of water means that you should drink water more than normal, as it helps avoid the side effects as you said, but of course without going to extremes. Perhaps one of the other members can give a more precise number in terms of quantity per day.
Also, please take your medication at the same time every day just before or with food as it helps with the medication absorption. Get enough rest, eat healthy (and avoid drinking grapefruit if you’re being treated with Daclatasvir®). In addition, never take antacids with Harvoni® or Epclusa® generics. Finally, the ‘During Treatment’ section of the FAQs page has some good information https://fixhepc.com/frequently-asked-questions.html Best of luck with your treatment.

More than normal but not to much.
http://www.dailymail.co.uk/news/article-1224051/Wee-For-Wii-water-drinking-contest-death-Jennifer-Stranges-family-awarded-10m.html

Life pivoting, From many years of athletics and working in warm and hot weather, you are usually drinking enough water if your urine is a pale yellow.
A rule of thumb for drinking enough water is 8 glasses/8oz, or 2 liters per day.

Drinking too much water can however cause water intoxication or hyponatremia, which is diluting the sodium level in your system.

The benefits of drinking “a lot of water” are:
1. Increases energy and relieves fatigue
2. Promotes weight loss
3. Flushes out toxins
4. Improves skin complexion
5. Maintains regularity
6. Boosts immune system
7. Natural headache remedy
8.Prevents cramps and sprains

The most important aspect of drinking water however is the color of your urine. If it’s pate yellow, you should be good.

Good luck of your medications life pivoting. I hope this information is beneficial.

Mrcleanrt