Problems with temptations while fasting!

Hey everyone,
So I have been attempting to start a water/juice/kombucha fast for the past few days, but am having so much trouble with giving in to temptations. Every time I reach inside the fridge, I see food that is good for me, but not on a water fast! So I have it. It is so hard because i have a roommate who, while I love her, does not understand fasting for health. How do I step away from these constant temptations? I have fasted before and have never had trouble with this! I would REALLY appreciate some advice, this is hard for me and I do not really have anyone to talk to about this!

Peace
C