Actually, depending on what you consider a Juvie, a 40 gallon is the perfect size. I think only babys should be housed in 20 gallons because of their growth rate.
Well, the thing about that is they cannot soak up the Nutrients without the UVB, so with out it passes right through them. That is the leading cause of MBD.
A few days wont hurt him at all, if youd like you can supervise him outside for 30 minutes a day, that is all he needs. My opinion is to not get a UVB bulb from this guy as it is, my bet is that he wouldnt even send the right kind. There is only a few bulbs that work right, ask us if you need help finding a bulb before you get the wrong one.
There is the possibility of any small reptile drowning in a water bowl, but its not likely at all. None of my dragons would even touch a water bowl, so I misted and gave baths to give them water.
That info is wrong. They have to have A uvb bulb to soak up the D3. Are you sure that is what they said? The bearded dragon section here is very small and not used often, if it was said a week ago then that thread should still be close to the top of the page.
Anywho, order some more crickets if you have not already, a couple dozen crickets should last a healthy dragon no more than two days.