I always carry that one that repairs the shield around, and always upgraded so it's used automatically.
Just in case something happens, I only got to lose 3 shields though, if I'm not wrong.
And I remember having a stamina potion in my pouch all the time since it was available, always with a mentality of "If I use it now, I won't have it when I really need it!" but I never got to need it
I didn't even touch the other potions.