Don't do what I saw one pilot do when we were using drums:
We'd carefully stored the drums on their sides, caps level with each other then up-ended on to a chock and given time to settle during the morning, ready to be used after lunch. This bloke decided he couldn't be bothered pulling his aircraft over to the drum so he rolled a just settled drum on its side across the tarmac to the the aircraft, intending to start refueling immediately. I don't think a blender could have mixed contents as effectively.