yes you can do it that way, or at least i have done it at various times much later than 2 pm start time, and it's worked. if you eat at 6:30, then no more food or water. at 10:30 would be your first Epsom Salt
dose, 12:30 the second one, and 2:30 am the oil/grapefruit.
good luck, hope you have a successful flush.