Questions about emergency kits/bags

These recent earthquakes reminded me that I've never prepared an emergency kit or bag, and I'm thinking it'd be a good idea to do so. The Tokyo Government has a website with recommendations based on your living situation, but this list it gave me seems insane for just 2 people:

Food
Water (for drinking, cooking, etc.)： 42 liters
Retort cooked rice： 42 packs
Retort-packed food： 14 packs
Canned food： 14 cans
Dietary supplements： 14 packs
Vegetable juice： 14 packs
Cheese & protein bars： 4 packs
Powdered healthy drinks： 14 packs
Set of seasonings： As needed
Dried or instant noodles： 7 packs
Pre-washed rice： 6 kg
Drinks： 14 bottles
Confectionery： 7 packs
Canned food (fruit)： 7 cans
Freeze-dried food： Appropriate quantity
Dry food： Appropriate quantity

Hygiene products
Antibacterial wet tissue： 140 sheets
Alcohol sanitizer spray： 2 bottle
Face mask： 14 masks
Mouthwash： 1260 ml
First-aid kit： 1 kit
Household medicine： 1 box
Disposable contact lens： Equivalent of 1-month use
Portable toilet： 70 time use
Teeth wipes： 140 sheets(about)
Body wipes： 14 sheets

Livingware
Portable gas stove： 1 stove
Gas canister： 4/3 per day per gas stove
Plastic wrap： 1 piece
Plastic bag： 1 box
Plastic gloves： 1 box
Aluminum foil： 1 piece
Toilet paper： 5 rolls
Tissue paper： 5 box
Flashlight： 1 piece
Dry battery： Sets of D, C, AA and AAA size batteries
Firing rod： 1 piece
Disposable body warmer： 28 pieces
Backup battery for cell-phone： Stockpile extra batteries matching the number of cell-phones
Cloth packing tape： 2 pieces
Work gloves： 14 pairs
Newspaper： As needed
Radio (hand-cranked type, battery-powered, etc.)： 1 unit
Multitool： 1 piece
Water supply bag： 2 bags
Portable stove： 1 unit
LED camping lantern： 3 units(at least)
Headlights： 2 unit
Cooler： 1 unit
Backpack： 1 unit

42 liters of water?? Where am I gonna keep that in my tiny-ass apartment??

Does anyone have any realistic advice about what to actually prepare and how much of it?

I'm also wondering how everyone goes about rotating expiring products. How often do you check for products in your emergency kit that might expire, so you can consume them and replace them with new items?

Thanks!