Even if this is trolling, this might provide good information for other people. Your first issue is that you are hurting your chances of success by limiting your choices in diet to subs. Just doing some quick math and keeping things simple, the average 6 inch sub is around $6.50 and the average 12 inch is about $10. Even if you only have a 6 inch sub twice a day(you will be starving most likely) you're look at $13 a day in just subs from subway and nothing else. Which comes to about $90 a week (not counting taxes and any additional cost).
My grocery bill is typically around that give or take $10 and I get way more than two 6 inch subs a day. So as hard as this may sound, you don't want to lose weight as badly as you think