To an extent, I have tried it. I have only tried it for overnights. Summer sausage, cheese, bagels or tortillas.

You can easily do it, if you find that right food that you personally like. Hey, people drink soylent days on end. In fact, a soylentish way of doing it might be best. Just make up a mix of "stuff" with all the right nutrition/calories that you want, and mix it with water when ready to drink.

And, then there is pemmican.

I've taken a vow of poverty. To annoy me, send money.