The volatiles analyzer on ISS works against a short list of known compounds. For anything else you just get a generic warning and have to rely on earth labs to

The volatiles analyzer on ISS works against a short list of known compounds. For anything else you just get a generic warning and have to rely on earth labs to figure out what's going on. You can't subsist on MREs for five years. Here's a cite for you about the space food problem: https://academic.oup.com/jn/article/150/9/2242/5870322 https://academic.oup.com/jn/article/150/9/2242/5870322 However fast your imaginary rocket goes, you have to wait 26 months for the planets to align so you can use it.