Right next to the Filmpalast there is a HaeagenDasz store. And just around the corner, in Meineke street, there is a fast food restaurant that seels soups. There is a shop for drinks nearby on the way to the Wittenbergplatz. A rucksack is handy for carrying food and drink, cups, the programs and pens, clothing, and all that. Rest Good films can be emotionally exhausting.
Some films can really be tiresome.
Anyway, there is no room in cinemas for people who need a rest. You are supposed to go in, watch the film, and go out. So you better know some places to find some rest. Alas, popular cafes are crowded and full of smoke. Therefore you should find yourself a quiet restaurant or a hotel lounge nearby.