One of the things about hitting the $1000 a month or less mark is going to be what is your expected level of comfort?
I've lived an interesting life. Twice I ended up homeless and made do living in abandoned buildings or prevailing on my friends to couch surf.
So I kind of developed a higher tolerance for what some might consider adversity.
I use public bathrooms all the time. I know people who are revolted by the idea, or being attractive young women might not feel safe.
Likewise I learned how to cook at a young age, being raised by a single parent. Then when I was in college I was always broke and lived near Oakland Chinatown so I got good at cooking cheap.
I dont buy a lot of prepackaged food which some people are very accustomed to as a way of life. In fact I am shocked when I go grocery shopping and the person in front of me spend $200+ on a lot of microwave meals, frozen pizza etc. It's not just expensive, but also unhealthy!
My common shopping trip is $15 of veggies maybe $5-10 for stuff like rice, noodles and bread, and maybe another $5 for condiments, etc.
Currently investigating lowering my insurance and cellphone data plan costs. Also moving my stuff out of storage in an expensive area to a cheap area.
I should be able to save a few hundred a month after I get those 3 figured out.