Do I understand that you can't get out to shop today? The question is not what to feed long-term but just what to feed today?
If I have understood correctly, then canned tuna would do in this emergency. Or some of whatever meat you have on hand for yourself - chicken would be great, just boiled or baked (plain).
As soon as possible, do get back to feeding actual cat food, which is a balanced diet, which straight meat isn't. But it is entirely correct that Purina DM is not necessary, not really a very good choice, in fact. Lots of commercial canned foods are better and actually cost less. Binky's charts (link in a previous post) will guide you toward finding something that is within your budget, available locally, and acceptable to your cat.