Storing cut broccoli in water can keep the florets fresher longer. For best results add no more than 1 inch or so of water to the bottom of a storage container and place the florets stem side down. Try to keep the portion of the broccoli with the buds out of the water as they are more fragile and can degrade if sitting in water. Once the broccoli is cooked, I don’t recommend storing it in water.