i wat to know the living costs in japan.

dear all,
i will be going to japan from may 20th to july 25th.
i will have to support myself there completely,including accommodation ,food ,travel etc.i want to know the cheapest and decent places where i can stay.i need info regarding hostles where i can stay cheap and commute to my institute(shimz) easily on a daily basis.plus i need to know how much money should i reserve for sight seeing etc, and how should i make most of the oppertunity without being ripped as i have heard that it is the world's costliest place.any kind of help will be appreciated
thankyou
rahul

Do you mean the "Shimizu (Shimz) Institute of Technology" in Tokyo? of Shimizu (Shimz) Corporatioin (Shimizu Kensetsu - construction - in Japanese)?

Then the Institute is in a middle of an industrial/warehousing area in central Tokyo, so I do not expect any cheap hostel to be close by. Are you coming on a business trip or a training program or something? Maybe you could ask the company if they have an employee dormitory or something you could stay at?

yes...it is shimzu.
what if i stay a lil away where i can get cheap accomodation and commute via rail or bus.is this option affordable(how r the rail fares). i dont think ill get accomodation at the institute.

You might want to check out housing like this:

http://www.sakura-house.com/

Train fares are quite reasonable I'd say, but I do not know your budget.