Good luck with the weigh-in. Let me know how you get on.
I think I read somewhere on this forum that Pepsi Max is okay, but not 100% sure.
I'm doing SSP. I've found it helps a lot if you prepare your food for the week in advance if you can. For instance, on a Sunday, I weigh out my chicken (uncooked) and prawns (cooked). I cook the chicken breast in the microwave with two squirts of fry light and some spices. I put each cooked chicken breast/prawns in a sandwich bag and either put in the fridge or freeze. That way, you only have to add your salad or veg to it for a quick, ready meal. I also find adding fresh chopped herbs and black pepper to the soups makes them more interesting. Adding ice to the shakes makes them so much better - I got that tip off this forum! x