You should take them back to Kohl's and ask why they don't have straps. Perhaps it was a mistake, or perhaps there are just certain styles that don't come with them. Either way, I'm sure they'd be happy to exchange them for you.
During your first run, you want your worms to cocoon quickly, turn to moths lay eggs and die. You second batch is the one you want to allow to grow....
My best guess is that the pebbles and brick contain limestone, which is easily dissolved in water and will raise the pH of the soil. You'll have to water with...