Plant a seed of Swiftthistle, trigger it, grab the food and get far enough away before the effect wears off.
It's even better when it's right on top of a hidden trap and you go to pick it up, but die instead.
Maybe you are lucky and the rations are upgraded!
What are upgraded rations?
There aren't upgraded rations, but if there were such a thing they wouldn't be destroyed by an explosion.
You can think about using a Potion of Levitation or 2 Stone of Blink (get by alchemizing 1 Scroll of Teleportation into 2 runestones). Other option would be to alchemize Telekinetic Grab Spell (Put Thrown Weapons into Liquid Metal and any scroll with any stone into Arcane Catalyst. Combine these twos to get 6x Telekinetic Grab.
Arcane Catalyst is gone, my friend.
Does fire destroy rations?
It doesn't destroy, say, chargrilled meat, so I assume that it doesn't destroy rations.
If not, the problem is just tripping the trap without being hurt, and you can do that by taking off your armor or weapon or something and throwing it at the trap from a distance to trigger it.
So to sum up solutions
Swiftthistle seed to basically freeze time, run in and grab it before the effects wear out
Stone of disarming to remove the traps
Potion of levitation to go over the traps
Stone of blink to blink onto it, if you have enough health then you only need one after you pick up the ration
Timekeepers hourglass to do the same as swiftthistle
Ethereal chains to move to it
Reclaim trap item to remove one of the traps
