Since you're still going to work then I guess you're still in good shape. In here, they prohibited people from going to work except for those whom we call as the frontliners - medical staff, police and military forces, limited utility workers, bank employees, grocery and drug store staff.

If it is just for lunch then I guess sandwich for a month is doable in times of crisis. You just have to have good ones for other meals like breakfast and dinner. As one medical staff had advised, do not panic about losing alcohol or toilet paper. You should focus on boosting your immunity to fight the virus.

Stay safe and healthy, friend!