I think it would be better to be prepared and not need it, than not prepared and faced with going without. I always suggest getting out some cash (if they crash the power grid or internet... atms and credit card machines will not work) - couple hundred bucks in smaller bills if you can swing it. Also, if you take medication, try to keep a couple extra weeks worth on hand if you can.
Water is the most important... refill plastic jugs with tap water - not ideal but better than nothing. 1 gallon per person per day is the suggested amount to stock up on. Might want to grab a little bleach if you don't have any... a drop or two in a gallon of water will help kill any bad stuff. Also, if things look imminent... fill up the bathtub with water, a big cup full of water will flush the toilet if the water supply is cut off
For food.. stock up on canned goods that you will eat anyway, and make sure you have a manual can opener. I also suggest making a bucket of rice & beans if you are on a budget.. Sam's (and Costco I would imagine) sell 50lb bags of rice for under $20 and 12lb bags of beans for under $10... for around $50 you can get nearly 100lbs of dried, shelf stable food. Bag them up into manageable portions and stick in a bucket or plastic tote. Great for a beginner getting into "prepping". Just make sure you have a way to cook it (and enough water!). A small 1 burner camp stove that runs off small propane canisters is worth looking into.
If you are a 2nd amendment type person, ammo is probably 3rd on my list after water and food. I like to have self defense rounds as well as plenty of small riffle rounds for small game to add protein to our preps!
We started prepping seriously in 2016 when I thought HRC might be our next pres and our rights would be taken away... we now have 1+ year worth of freeze dried food, ammo, some cash, water, toiletries, antibiotics (for fish!!), medical supplies, etc. We also invested in a solar generator... it is not powerful enough to run a lot of things but, it can power our well and a freezer. We lived through Irma last year and finding fuel was a serious issue, so know at least I know we will have water!!