Noob question here. My R/C knowledge ends at the aisle at Toys R Us.

My son has an amphibious buggy and another kid used it, then left the remote on the river bank. No service parts at all from the OE. What's the cheapest way I can get this thing rolling again? It's a 49MHz.

It works like a tank: left side FWD-REV, right side FWD-REV

I need a programmable remote and the steps of how to get it working right.