We had an issue where a guy on the ship wasn't taking a shower often enough (he was a pretty good sized guy) and he was getting heat rashes that would get infected. He got off watch for over 2 weeks for this while out to sea, leaving me and the other woman in the watch rotation to stand 6 and 6 the entire 2 weeks. 6 hours on watch, and 6 hours off watch for 336 hours at least. Plus, at least once for each of us, we also had to stand sea and anchor, which meant as soon as we got relieved by the other person, we had to stay in the plant as backup due to what the ship was doing for a few hours at least. We got very little sleep despite both of us being fully qualified watchstanders all because one guy didn't understand the importance of hygiene. So yes, we ensure that we get a frickin shower everyday. Working in a space that is normally over 100 degrees F under the vent tends to warrant daily showers.
However, I think that this number seems farfetched and is likely a myth since I know how much water we use per day on average on a carrier, and it hasn't really changed since they began operating these carriers. It isn't like water rationing didn't happen aboard ships prior to women being put aboard.
One of the problems with the Navy is that it likes to change to "new" systems without properly testing them for actual carrier life. This is what the main problem was for the Bush's sanitation system. I never heard of the problems the Bush is facing on any other ships, but I have personally witnessed similar problems with another system aboard our ship where basically the Navy changed out an older (admittedly not efficient) piece of equipment with new ones. It was obvious after the first month or two these new ones were onboard that they had never been tested for operation in our environment. We had to do maintenance on them twice as often at least than they said should ever be done. I don't think the manufacturer or those making these decisions understand at all what type of environment a Navy ship is. Now, for the sanitation systems, I'm not saying that the sanitary products should be ignored as a cause, but I am saying that if just one takes down half the boat's toilets, then that is a major problem because unfortunately people are people, and there are going to be stupid or untrainable people in the Navy, just as there are anywhere, including women.