Personally, I wouldn't try getting rid of both of them at the same time.  Give up the fountain pop.  Its your biggest weakness right now.  Throw away your mugs or what ever you fill and use some mental fortitude to not get it at the quick shop.  Buy something else when you're there.  It will not be fun for a few weeks.  Reward yourself some other way......steak dinner at home?  The steak becomes more affordable if you're not buying sugar!