Containers are not included in purchase prices. You are welcome to bring your own. Some grocery store florists give them away or you can get new dollar store trash cans. 5 gallon buckets can be purchased from a home supply box store. If buying your own, make sure they are not too high and squish the blooms. Typical stem length is 14-18"so a side wall of 10-12" is preferred.
When picking up your florals, you will need to transport them in an air-conditioned vehicle. They should be stored in the fridge, or very cool room, out of direct sunlight until use.