Use a small cricket keeper with moist dechlor watered paper towel on all four sides and the bottom. Have the car warmed up. Wrap the outside of your critter keeper in a dark blanket or towel to keep it warm.

I think if it were me I'd cut up some worms into little pieces, add dechlor water and a pinch of the calcium or vita powder and toss it right in the blender. Use leuk warm or slightly warm water, not cold. Like a milkshake for him. It'd be easier to pull up into a syringe.