1000yen gets you the following.

1) Food:
Typical cooked meal (rice or noodles) 800-1000yen. Can get 4-600yen food also at convenience stores or shopping mall food departments but food has been left the whole day so not freshly cooked. Family mart egg mayo sandwich 200yen. 1 can kirin beer 234yen. 5 slices medium fatty tuna sashimi 1000yen. 2 litre mineral water 130yen. 1 small piece pablo egg tart 185yen.

2) Transport
1 day JR Pass 750yen. Comparing minimum price of metro/subway/train ticket, Tokyo 170yen, Kyoto 220yen. This is from 1 station to the very next station. Shinkansen (bullet train) hakone - kyoto 11530yen

3) Others
Cigarettes Marlboro 450yen. Nike shoe (subjective to style and design), bought mine at 8748yen. 32gb sandisk sd card 1650yen.

4) Lodging
In Tokyo, typical 400sq ft apartment is about 80k to 100k yen a month. In Osaka about 60kyen. I rented air b&b at about RM 400 a night for a proper clean and comfortable studio apartment during my vacation. But really, the size of the whole apartment including balcony and toilet is smaller than my 1 master bedroom alone.

In conclusion, 1000yen won't get you far if you include rental. Most of the locals I spoke to cut a lot of spending on food especially. They usually cook in the morning and bring to office and eat. And they go back and cook dinner again. To them, a sushi meal is an extravagance, only enjoyed once or twice a month. And it is really not surprising to see men and women in coats buying their dinners from the convenience stores like 7-11 etc. Most of them don't own cars but then you don't have to since their public transport is top notch.

If you enjoy alcohol, you need to follow a local drinker as well. There are many hidden joints where you can get a pint of beer for 100yen. If not, you will have to pay 500yen per pint at a place with english menu and english speaking wait staff.