First of all, I was having a nice day until I read this. But alas, here’s my two cents. Since you said you will be travelling, not eating will be a problem. Why? As other comments pointed out and as I went through this myself a few weeks ago(not intentionally, just financially dependent on irresponsible traumatised individuals who get to decide when/what/why I eat- I am working on it, don’t worry), not eating for extended amounts of time gets you weird cramps and liquid poop. You don’t want that, especially when you need to move. I don’t know the environment you will be in, but aim to eat a bit those days, processed solid foods will do. Cheese, eggs, bread(bagels),plain pasta(ALREADY BOILED) if available. Avoid sugar in fairly large quantities(dehydrating), coffee(obvs), fruits, even vegetables. Your body will hate you for this, so when it’s over please take it easy and eat&drink water properly. It’s good that you will be moving, hopefully not too intense activity(because you’d need to eat/drink water properly) as that will distract your brain from wanting to eat/drink water.(again, sauce: former retail worker, wasn’t done intentionally, I can’t stress this enough. It just sorta happens). Make sure that you at least sleep and rest properly, and as others have pointed out, this isn’t sustainable and not recommended by any means. Long term lack of nutrition fucks you up in ways I can’t even begin to describe, take that shit from me. In the offchance you tattoo your asshole(and that you are one who has that tentacle tattooed on the asshole and are having it re done/touched up), you can simply wash after you poop, you don’t have to go through this. Also you can try anti diuretic and anti liquid poop(for a lack of a better term) medicine. Looking foward for an update, hope you’ll be ok.