You need a 10 gallon tank or similar sized plastic tub and a screen lid to keep them contained. Paper towel tubes or toilet paper tubes work well for them to climb on, they can't be on a bare floor. A shallow dish for food and water, I use plastic lids. For food you can buy powdered cricket food or you can grind/smash a quality dog food. For water you can buy cricket gel or use cotton balls soaked in water, they will need to be changed daily. You can also feed them left over fruit and veggies.
The crickets need to be kept at room temp, too hot or cold and they will die. A screen lid is also necessary, not enough air flow will also kill them.