You can buy additional temporary items from the Bastion Prefect, and sadly a Reraise Scroll is not one of them.
All are bought with Resistance Credits.
Lucid Potion III
Lucid Ether III
Lucid Wings I
Lucid Elixer II
That is to just name a few, all of these go under Temporary Item so if you don't use them in a Bastion battle you can still use them in any other Abyssea area.
The main problem with a Bastion battle at the moment is there is a LOT of AoE attacks flying around which kill people very fast. In an average run you're looking at 2-3 Gears, 2 Chariots, 2 Dolls and 2 Acrolith as well as the Spheroids.
The AoE damage really builds up and not having Reraise to hand (Earring would solve this i know, but still) is a bit of a downer especially because if you go down at the start of a battle you do not get any EXP until you are revived, which is unlikely until the battle is over and even then it's too late.
Beyond this place of wrath and tears
Looms but the Horror of the shade,
And yet the menace of the years
Finds, and shall find, me unafraid.
It matters not how strait the gate,
How charged with punishments the scroll.
I am the master of my fate:
I am the captain of my soul.
Invictus -- William Ernest Henley