Welcome to the forum from Germany. I will post something here from another thread I wrote in, maybe it could be a good start...
You do not need to buy the freeze dried stuff. Usually too expensive and out of stock now...Just get your rice, beans, noodles, canned meats, powdered milk, spices, coffee, tea, SPAM, honey, peanutbutter and jelly, salt&pepper, canned tomatoes, fruits, cooking oil or crisco, margarine if you can take it, anything you can still get. Then do not forget the soap, shampoo, TP, Q-tips, razorblades, toothpaste and brushes, female needs of course. Then look into First Aid things. Alcohol, bandaids, tape, compresses, baby powder/oil and maybe a burn kit. Sun-shade, vaseline, pain-killers and needed medications with lots of refills. Then look into the extra clothing, socks and underwear. Winter clothing and Work gloves. If you have weapons, ammo in bulk, BB guns with ammo, pellet gun with ammo. These are quiet for hunting and not being heard or shooting in the city without the cops coming. Find a way to make your location "not lived in". Paint the walls black and make it lood burned out. Black out the windows, make the door a bit bullet proof, have a hiding place which IS bullet-proof, keep the food and ammo placed in different places if some gets stolen you will still have a smaller stash. Start watching movies in the internet and you-tube on prepping and getting a Bug-out-location (BOL) ready to use. Check your stuff regularly and stay ready. GP