Here's what I do.
I have 22 Gal. Sterlite containers from Walmart. I cut most of the top open and duct taped window screen in it's place. I then put in 7 paper towel tubes and one regular egg crate bottom. The tubes I put in one layer at one end and than put the egg crate at the tube ends so they won't roll.
Then on the other end I have a sponge in a dish, 3 lids filled with dry cricket food, and 3/4 of an apple cut into 6 pieces. I actually cut the bottom out of a ziplock container for a dish and then cut sponges into disks to fit it.
When the crickets come in. I put in the tubes and egg crates and dump them in. I take out the potatoes that were shipped with them and lay the egg flats on top of the paper towel tubes. You'd have to turn one so it doesn't interlock. Then I put in the food, apples and sponge. This is good for 3 days. I might have to add more food once in 2 days if the crix are particularly hungry from their trip.
Every 3 days I add food as necessary, and change the sponge and apples. I tried vegitables and greens in the past as beachbeardie suggested but the crickets poop was extremely moist and messy. This made them moist, dirtier, smell more and I felt unhealthy for my dragons to eat.
As necessary, if the crickets smell, I transfer them into a new container (usually about every 2 weeks if they aren't fed out by then) otherwise I don't bother with cleaning the frass from their enclosure. When I open the bin(s) every 3 days I transfer about a 3 day supply into a kricket keeper for daily use.
I buy 3/4" crickets for my adults and can keep them for a month or so if necessary. After that their life span is over. I keep all my crix. at room temp in my laundry room.