salsa works just fine. basically rotel is just chopped up peppers, onions and tomatoes. so if you can get fresh salsa, that works. if you can only get jarred salsa, that works. if you can just get peppers, onions and tomatoes and chop them up and let them sit in their own juices a bit, that works.
if you like spicier, pick spicier peppers. if you like milder, then green peppers work too.