What's the emergency candle for (in your kit)? Light? get a good LED flashlight. Heat? Get a small propane campstove like the MSR Pocket Rocket. Signaling? Much better options than a candle.

As has been said, go through the kit quarterly and change things. It helps you remember what's in the kit.

As for meds and other heat sensitive items, get a small cooler. What color is your vehicle? Folks it's a fact that white cars (and trucks) are cooler in a hot sun. Why people buy black and other neat looking (but HOT) colors. . . Even here in SOCAL it's not unusual to see a black interior wrapped in a high gloss black paint job.