Gareth,
You'll have to take anything I say with a grain of salt, naturally.
I'm no hydration expert. Just a guy who likes to read a lot.
I have long suspected (even before my fissure) that drinking 64 oz of water a day may not be correct. What good is excess water if all you do is urinate it right back out. I honestly think our body keeps the water it needs and discards the rest.
Drink juice, and your body pulls the water from the juice and uses that.
Most any water-based fluid will provide you with water.
Now, during the course of a day, you sweat and urinate and water needs to be replaced. But did you sweat and pee out 64 ounces?
An active person needs to replace more water than a sedentary one.
A 98 lb secretary has different water needs (and nutritional needs) than a 240 dock worker.
Certain medical conditions, naturally, will require more or less water intake. But does an Anal Fissure?
My belief is, NO! You still only need the amount of water required to keep your stools moving through your system AND soft.
It's not good advice for me to say so on this board, perhaps, so what I'm about to say comes with a disclaimer:
I can't promise that what works for me will work for someone else. That said: I am back on the same "diet" and fluid intake I used to have before my fissure. And guess what. My bowels are just fine. In fact, my stools are more consistant now than they EVER were while I had my fissure, and I can't see how the surgery could affect THAT. I drink coffee twice a day. I drink some water at work but after that, not much.
As for what water is best; Its all the same, basically, once your body begins to use it. Just as long as it wasn't contaminated.
Or it came from Mexico (HA HA, couldn't resist THAT!)
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Interestingly, I read an article just yesterday by some nutritionalist. I think it was MSN, not sure. His thesis was that coffee (and colas) really don't dehydrate you as much as is believed. When you drink a cup of coffee, yes, you'll pee. But the amount is not too different than peeing when you drink water! I wish I could recall more or find the article.
Whether it's true or not, who knows. But that has been my experience...water makes me pee every bit as much as coffee.
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So, to wrap it up, I believe you should drink enough to keep your bowels fit but that you DON'T have to drink 64 oz. You need to drink the amount that Gareth's body is subtly indicating you need. Look back on a point in your life when you were fissure-less and healthy. How much water did you drink then? That's probably how much you need now!
Hugh (not)