In Lodz, is very easy to buy things. There are lots of small shops, better of kiosks, in which you can buy what you want: paper, cigarette, cold or hot drinks, fruits, vegetables, bread and so on.
Even if it seems closed, try to open!
Go to the main Square in town & eat in the Bars & Restaurants there, very good value! Nice posh hotel in the middle of town where they do excellent cakes! Also visit the Russian Markets, brilliant bargins to be found but remember to 'best price' barter!
Fondest memory: Spending the day having a picnic in a nice park!