Here is the list of items covered and links to purchase them (mostly from Amazon): https://nickc.podia.com/bugout
There are pros and cons to buying a commercially packaged go-bag.
The pro is that if you don't currently have anything to start with, the best reason to buy one is so you will immediately have one.
The con is that they are universal, meaning that they will contain items you may not need and may not contain items that you do need.
So if you can (and this is why you should) build your own go-bag, here are my recommendations of critical items that you may not have considered.