Can i use an unlocked iPhone 5 on verizon without data plan?

I have a phone with verizon service (it's a flip phone with no internet services)
I'm soon getting a unlocked iphone and was wondering if i can use the plan i'm using now for the phone
so for ex. If i can use it for the exact same purposes such as calling and texting without Wi-Fi but not need for internet unless i'm in a Wi-Fi zone.

Does the 97/98/99 isopropyl alcohol water repair thing work when using a iphone?

My friend dropped their iPhone 4s (white) in the washer while trying to get it started and they didn't notice it was in there until they started it. So they reached in there and got it out. But it was on a white screen and took the back off (they bought it used and the previous owner left out the back screws and my friend got a small enough screw driver to fit in there) and took the battery out. So now his phone is dead and I told him to soak it in the closest to 100% alcohol. They have 95%, and 98%isoprospyl alcohol. But the containers are low. Can he mix them and fix the phone?

About to buy an iphone tommorow?

So i'm about ti buy an iphone 5s 64gb tommorow without contract and any carrier, how much would that cost? Because i went on apples website and checked it said around 900 but i'm still not sure. Anybody know?

Why did the price change so much?

I wanna upgrade my phone to an iphone and I looked on the verizon website yesterday and saw that it was $100 but today I look and I see that it changed to $200. Why did the price change so much in one day? Also, is it cheaper to buy it in stores or online?