I know what you mean, you see all those yummy, fattening things in the supermarket and it's hard to leave them behind (I specially love chocolate). I have been trying to get over this by planning
to buy a little special something when I shop. Sometimes, if I really feel like it I buy a chockie (but make it a small treat, like a Freddo or Milky-Way, rather than go for the family size block. (Don't laugh, I would have done that once!
But usually, I make it something nice, but not too naughty, like some fruit - maybe something a little more expensive than I'd usually buy, a creamy low-fat dessert, or a nice low-calorie treat. There are so many yummy low-calorie goodies in the supermarket now. This week I bought a small 97% fat free brandy pate and some rice biscuits (quite low in calorie). Then I sent them home with my mum and told her I'll be over to share them with her later! (Just in case I was tempted to scoff the whole thing.... I know me, lol)
A 98% fat free iced coffee doesn't sound anything to feel guilty about - at least you got some calcium! And it's meant to be a healthy lifestyle, not torture!
Get rid of those guilts, girl! Hope you enjoyed the treat.