Great advice has already been posted.
You are already doing the most important thing and that's Thinking
As mentioned, keep reading, researching and practice/work at skill development.
I 100% agree that water storage and the ability to treat questionable water is a major priority.
Having containers and unscented bleach on hand is a good idea.
Also the ability to filter & boil water
We have and use a Big Berkey daily...but we also have redundancies, like rain water barrels, a 55 gallon water barrel, several 5 gallon water containers, and multiple smaller water containers.
Also several ways to boil water and a sand/bucket gross water filtration setup...for pre-filtering pond/lake water and such.
There is a lot of great suggestions in this thread already...but I've had to go several weeks (post Katrina) without safe water to drink, and it made a believer outta me.
As far a food storage...the copy canning
suggestion is simple and easy and won't break the bank.
Just make a list of your priorities, ask questions, and start doing the work.
If you aren't already familiar with firearms and/or don't own any firearms, then I'd definitely second getting some trustworthy professional instruction.
Good Luck along the journey.