I just spent the entire summer being homeless travelling in the UK and sleeping a hammock in whatever woods I could find and met some great people and had an incredible time
It only cost me £2 a day in food (would check reduced aisles in supermarkets and build my daily meals around that and £300 total on public transport for 3 months, showering and washing clothes in toilet sinks
Total cost was like £350 a month and £180 of that was on nights out or events