The short answer is yes and no with several factors to consider. Nutritionists do count the water content of food as part of your daily intake of water.
The particles of other ingredients (besides water) in soft drinks dilutes the water in the first place. So drinking 64 ounces of a soft drink that is made up of mostly water is NOT exactly the same as drinking 64 ounces of just plain water.
Your body will also expend some water to process those other ingredients in addition to the dilution effect.
Due to these factors you will have to drink MORE than 64 ounces of the soft drink to actually get 64 ounces of water into your body.
There are some other things to consider as well. The two drinks you mentioned contain artificial sweeteners. One contains Sucralose and / or Acelsulfame and the other contains Aspartame (a.k.a nutrasweet).
There have been many books written about the perceived dangers of Aspartame.
Here is a web page that has a very short synopsis of the dangers or potential dangers of all three of the artificial sweeteners listed above.
One interesting news story about Aspartame side effects is the possible link between Aspartame and migraine headaches. There are hundreds, possibly thousands of articles about the perceived dangers of artificial sweeteners.
I am aware that there are people who say that Aspartame and other artificial sweeteners are not bad for you and are perfectly safe to consume. I’m not interested in entering the debate. However, I would suggest that it is better to error on the side of caution.
I will give you two pieces of subjective evidence I have come across.
1. Clint, an associate from work, told me that his father was having seizures. His father consumed a LOT of diet soda that contained nutrasweet. He told his father to get off the diet soda. When he did, the seizures subsided.
2. I knew a couple in Dallas that told me the story of their daughter who went into a coma that they attribute to consuming nutrasweet. She had mild brain damage after recovering.
Subjective and anecdotal? Yes, I agree there is no way to prove beyond a doubt that nutrasweet was to blame. Again, my opinion is to error on the side of caution.
The amount of water to consume per day
As far as the quantity of water goes, I know that nutritionists and others professionals believe that you should consume 2 liters – approximately 64 ounces of water per day
However, I can also tell you that when I was a student in professional school, my biochemistry teacher told our class that 2 liters was not enough and that humans should have up to a gallon of water per day. If I remember correctly, he said that the gallon figure was for a person weighing 150 lbs.
This guy had a PhD. in Biochemistry. He really, really knew his stuff and I put more faith in what he had to say than the standard 2 liter answer that you read about in text books.
It’s hard to drink even two liters of water per day. I can tell you that I struggle to get even a few glasses of water in per day.
I understand the temptation to flavor your water. What I have found useful is to put a few drops of liquid minerals in my water. That seems to make water easier to drink.
The liquid minerals have a concentration like that of salt water and mimics the mineral content of human blood. So, I figure it is probably a safe bet.
However, the debate on trace mineral supplementation rages on. Some say it is bad for you and many others say it is good. I’m not interesting in arguing that question. I do use the minerals to make my water easier to drink.
Recap: Even 64 ounces of water may not be enough, especially when you consider the dilution and elimination factors. In addition, there may be consequences to utilizing drinks with artificial sweeteners.
Hope that helps, feel free to ask a follow up question.
The Earth – Mostly Made of Water – as is the Human Body
Keep it replenished with a healthy supply.