Ok, first, I probably earn the title of Captain Hydration. I have at least 5 Camelback options in my family to draw upon.
From the very flat 50 oz that can actually go under clothes, to the backpack style like Cfm uses (which has a 102 oz bladder) all the way to my vest:
See here: http://www.camelbak.com/government-mili ... -vest.aspx
I've modded it a bit....
But I'm on my feet a lot...I work over 40 hours during the event for Gate/Perimeter as well as working as a Ranger.
The vest is awesome...I have pouches and funny lights/buttons to soften it, but it's reallyu great to just be able to zip up a thing and be done with the "luggage" need. Granted, I end up carrying a lot for me (and to help you all if you need it)...two of everything...chapstick, goggles, pocket knives, some para cord, dust masks, camera, writing pad, etc.
As others have said, a good option if you playa bike is to buy one of those cheap horizontal racks that go behind the seat. You can then fashion fairly inexpensive "pannier" bags for it, complete with locks. You could then store gallon just, one in each side if you liked.
That being said, although I drink a gallon off playa, I find I can manage out there through a combination of solutions.
First, I drink water w/Emergen-C electrolytes on a schedule out there. Yes, whether I'm thirsty or not, I mix a packet into an 12 oz bottle of water, shake and drink. I do this at least 4 times a day. Easier than you think....one first thing while waking up....helps get the first pee of the day going! Eat, get ready, putter about....make one up and down it before going out and about for the day. I generally always have a 3 liter or better camelback. If I am carrying the backpack style, I might throw an additional 12 oz botttle of water or two in.
BEFORE dinner I have another prepped bottle of emergen-c/water in same way....drink some water with dinner and before going out. Finally, I do one final one before bed, no matter what. If I've been drinking alcohol, I might add an advil or two ;-). I'm ususally hanging with campmates late at night...so after a few nightcaps, I simply switch to that bottle for my last drink of te night. Very easy to do.
So, now you've supplemented your daily water rationing by 48 oz of water and electrolyte that you didn't need to carry anywhere.
Another general tip that I would say goes to the reason I have so many different cambelbaks. I work in the dust, but also hike, snowboard and bike in default. One size does NOT fit all and having convenient form factors really helps to encourage you to bring it along for a certain activity.
As for the hose covers and caps, yes they do indeed work and help. Another tip to make use more pleasant is to blow the water from the tube back into the pack after each drink. This is because that water is often the coldest, so having water heating in the tube while you walk isn't the most pleasant first couple sips to take. You can tell the people that don't do this...their first big swig immediately gets spit out on the ground!
The fox provides for himself, but God provides for the lion - W. Blake (attribution corrected)