There site needs a little work but Doug is a good guy and supplies quality crickets. Just tell him I sent you and he'll take care of you.
We don't use water sources for our insects, instead we utilize fresh fruits and veggies. Apples, romaine, sweet potato, orange slices, squash, etc. have always worked better for us.
As far as the amounts of gutload, unfortunately I don't really know. We use alot of it as we have thousands of roaches of 10 different species and go through crickets like it's a contest. You'll want the gutload to last for a few days but no longer than that. You'll find that they eat it pretty well so having too much usually isn't an issue.