Mereen was blown up

and, in trying to fix it. I created a bigger mess can someone help? I did a roll back and in doing so re-created lava. Not being savvy to eliminating lava, i pour water on it. How do i repair my damage with out again recreating the lava??

I fixed the little damage that was left
and for the future, its easier to stand in the lava and use //drain 10. It also might remove nearby water, but thats no problem