1/2 cup cream soda
If you do not have cream soda, you could use coffee or water.
1/2 tsp salt
The original recipe called for 1/2 tbsp. I wasn't sure if this was a typo or if it was intended to be a really salty caramel. I only put in 1/2 tsp.
1/2 cup corn syrup
I use light corn syrup, which is not high fructose corn syrup.