Most whiskey bottles are white bottles.
So use them for white wines only. When storing reds in them and not keeping them in a dark locker the color might fade.
Second if the caps are allright you can reuse them. But test this thoroughly.
I think the bottles neck might be a bit weak to cork them so use the caps.
I re-use bottles with screw caps for my early drink or table wine just once and then dispose them.
Luc