I'm in Thailand and my grill that I purchased a while ago is a standard type charcoal grill. The grill came with a square metal grate that sits at the bottom of the grill and is what you place the charcoal on for cooking. I just found out that it was left out for several months and is now completely rusted through. Much of the grate is just falling apart (see photos). I assume I need something that sits at the bottom and insulates the charcoal from the bottom of the grill... or is it more something for a cleaning convenience? I could still use it and put charcoal on top of what is left of it, but I worry about rust dust getting into the food. I thought about buying a wire grate and maybe a small cookie sheet and putting them together to replace the old grate. Not sure what to do. Any ideas?