Hi Heaven can wait,
Please do not do this! Chewing food and then spitting it out is a serious eating disorder, so you really need to nip this in the bud. I can't stress enough how bad this is for you hun, so please try and stop doing this. Isobel posted some information about the condition:
http://www.minimins.com/cambridge-diet-forum/10663-research-chewing-spitting.html
There are no rules for how to eat the bars, and eating it throughout the day instead of all in one go is absolutely fine- many people cut theirs up into pieces and put it into the fridge and have the pieces throughout the day to keep hunger pangs at bay.
Don't worry if you have to have 4 packs a day instead of 3, I often do this as I am normally a snacker and find I have to eat more often.
Have you tried making the jelly? You mix 1 1/2 scoops of mix-a-mousse with a tsp of water falvouring, 400ml very cold water and a drop of red (or orange if using orange flavour) food colouring in the blender. Whiz it all up and pop in the fridge for a few hours. Once you scoop the froth off the top there is really tasty jelly underneath. Although this isn't especially filling, it helps psychologically as you are physically eating something.
Alternatively, if you are really struggling with the diet on sole source, why not try moving up to the 790 calorie option? This way you can have a protein based meal in addition to your three packs, and this may just help you not need to pick at food.
You've done the right thing posting on here, and I'm sure a counsellor will be along who can advise you of more options, but as I say, don't go along the route of spitting food out as this really isn't healthy. Have another pack if you need to, or try having half a pack at a time, so you have something six times a day instead of three.
This diet is very hard, and you've done so well to get to week two!
Hugs, and good luck- keep posting xx