I used to keep crickets for my frog, but also found it to be a bit of a hassle. I feed earthworms/nightcrawlers (found in outdoor fishing supply section) instead.

When I did keep crickets, I found that those hydration gel cubes/orange cubes would dry up pretty quickly, but they ARE easy to use. There are also little cricket pillows, which are basically cloth/plastic packets that have diaper gel inside; you soak it in water, and it puffs up, holding water.
For food, plain dry oatmeal worked really well - it doesn't spoil, rot, or grow fungus, plus you can dust it with extra calcium/vitamin supplements to gut load. You can get big oats in cylinders, which last a good amount of time.
For the housing, a small glass aquarium with screen top works really well for large numbers. Sand works well for substrate - it's easy to clean for dead crickets (use a litter scooper), and bacteria/mold can't grow on it. Make sure you have fairly deep dishes for the water source since it can clump sand.
That's pretty much my experience with crickets.
Oh, and also, white crickets are ones that shed recently - try to feed those off quickly; they're easier to digest.