aries2756: It all depends on the sem. Different ones have different accommodations. There are some that do provide all meals/cutlery/etc. and have laundry services on premises.
But the footwear is a VERY valid point – the most important thing to bring is a good pair of sneakers! You walk A LOT in Eretz Yisroel (esp. Har Nof) and there are also tiyulim to consider…