Plenty of Food Storage
In order to stick rigidly to the plan, you'll need to prepare all your food, which means packed lunches (and in some cases, breakfasts and dinners, too). You'll probably be bulk-cooking some meals too, so make sure your kitchen cupboards are well-stocked with Tupperware, sandwich boxes, and food containers. The most useful ones I've found are Systema Salad Boxes (£6), which have built-in compartments and tiny tubs for dressing, and Noodle Bowls (£6), which are great for anything saucy that needs reheating. A good quality reusable water bottle with measurements marked on the side is also a good investment, as you'll be drinking a lot of water, and this will help you keep track.