>>528947Moleskins
I always have them in my first aid kit. At least a full sheet.
As soon as you feel a possible blister coming on cover it up with full patch of moleskin.
This alone will stop the blistering if done early. Otherwise if it has blistered already. Clean and cover the aread with bandage and cover with a patch of moleskin.
You can finish the day or keep moving with out it becoming worse.