Realistically, you should always try to keep a decent food storage in your home.
Not only does proper food storage mean you are prepared in the event of some disaster or item scarcity, such as toilet paper during covid, but it also keeps grocery costs down, as you can buy discounted items in bulk and work through them until you find them at a good price to stock up again.
I realize that storage space can be limited in a home, but even when I lived in a tiny apartment I did my best to dedicate enough space for a month or two of extra food supplies.
I’m sure it varies from country to country, but here in Canada, at least Ontario, which is the only province that I am familiar with when it comes to teaching requirements, you would definitely need to attend teacher’s college, which is a two year program.