if you are still money conscious and want to have a preparedness bag for you and your kiddles, i would start at walmart.
you can get the outdoor products backpacks relatively cheap. and they have most if not all things that you could need or want to put in there.
on youtube there is a guy who did a walmart bug out bag for right around 200$. i forget the name right now, but if you do a search he will show up.
since this is what you want to do, do research and make lists and then other lists, see what everyone has. then go and see what fits your needs. everyone will have different stuff and everyone's methodology is different. take in all that you can, and do it cheap until you find what works best for you.
Yep I would love to have a bag for each of us ready for sure! I started a list last night and have a few of the things but really want to get more: ) Thank you