How soon after surgery was the blockage? I had a "blockage/no blockage" as well about
a week after surgery. I think my intestines tend to wake up in fits and starts, so they sort of wake up and go back to sleep on their own for a while after surgery. I've had very mild blockages in the past with my first ileostomy and something always "pops out", but nothing did with this one (which was way more than mild), so I think that's what happened to me.
Anyway... regarding pure water, regular water is not very easy for the body to absorb. It ends up not doing much besides rushing the rest of your food through your system, leading to more watery output and even less water absorbed by your body. The body is best at absorbing liquids that have a concentration of sugar and salts similar to your own blood -- that's what rehydration solutions like Pedialyte do.
Regarding positive stories, I had an end ileostomy like you for four months after my first surgery and I LOVED IT. Once I learned how to eat and how to take care of the stoma it was awesome. I was able to eat pretty much all my old favorite foods and even drink strong black coffee (totally verboten while I was sick with UC). I traveled, biked, ran, worked full time, ate a seven course tasting menu (no substitutions and I ate almost everything!)... I very seriously considered making it permanent, but kind of in the flipside to your situation, I only chose to move forward with the j-pouch because everyone said I had my youth and otherwise good health on my side.
Anyway, I'm sure others will be along shortly. The weather stinks here which is why I'm stuck inside on the holiday weekend posting on HW
dx'ed UC pancolitis 5/12
past meds: asacol hd, VSL#3, apriso, rowasa, xifaxan, 6mp, cortifoam, pentasa, cimzia, canasa, butyrate, flagyl, cipro, prednisone, remicade, methotrexate, cholestyramine, cortenema
current meds: none!
step one: colectomy, end ileo 1/16/13
step two: j-pouch construction, loop ileo 5/1/13
step three: takedown 7/31/13