I got a pouch on my spellcaster, it contains scrolls of every kind I've found. I also got a pouch on my main ranged, it contains a few of each arrow type. I add the pouch to the hotbar to have them easily open midcombat. And a third one for throwables. Whenever I switch party members, which I often do, i only have to drag over one pouch and re-hotbar it. That way I have always available every kind of elemental combination whenever I need. Which I promptly forget and end up fighting mostly with swords.

But its darn useful when I get a fight I cant win with swords. A cheap but fun one is create water over a big area, one ice arrow, and a rogue with anti-slip boots.