I find it helpful to modularize an outfit into subcomponent kits:
I fully agree. Depending on what happens, there will be overlaps in needs so having modules that can be readily accessed means you don't have to have key things replicated in all emergency kits.
Just grab the appropriate modules as dictated by the situation, whether you're bugging in or bugging out.
Of course, there will be some replication due to the need for multiple redundancy or multiple family members.
For us (me and my four school-age children) the biggest concerns are earthquakes, power outages and, to a lesser degree, floods). Things can get rather soggy hereabouts with enough rain but we've felt numerous shocks that were centred in Taranaki and Wellington and we live close enough to Hawkes Bay to be affected if there's another Big One there. We've also had numerous power outages through one thing and another.
The big problem with power outages for us is that we have a water tank and rely on an electric pump to get any water. To rectify that, I'm thinking in terms of buying a 12VDC-to-240VAC converter box that I can plug the pump into (it uses a standard household electrical plug) and hook it up to the car battery. If the worst came to the worst, I could run the car's engine to keep the battery charged.
We have gas cookers and canisters as part of our camping gear and a gas barbecue as well as a free-standing wood-burning fire with a flat top on which we could put pots etc, so that's water-heating and cooking sorted for quite a while.
There are also candles in the cupboard and plenty of flashlights about the house and in our camping gear.
For earthquakes and floods, it's just a matter of determining whether or not we have to evacuate.
If evacuating, we have our camping gear - which has sleeping bags, warm clothes, wet weather gear etc - and a "documents bag" which contains all the important documents that CD recommends you take with you in an emergency evacuation.
The camping gear is modular - divided into clothes to wear while travelling, survival equipment (focused on survival in the wilderness but would have other applications), and sustainment gear (spare clothes, mess kits, toiletries, cooking stuff, tents, sleeping bags etc).
Not everything would be required if evacuating to a CD shelter or a family member's house, but a lot would (and if anything goes wrong getting to the shelter/house, at least we've got the means to survive).
The camping gear is designed to be carried while walking (this is backpacker camping stuff, not "fill up the stationwagon and drive to the site" camping stuff), so if we had to abandon our vehicle and walk with all our stuff to our destination, we could. The "documents bag" adds little encumbrance.
The CZs (452 ZKM and ZKK 601) would not be needed in most forseeable emergencies - not unless food lines were so badly disrupted that we had to hunt for food - but they're there if needed.