Older movie in color, shooting scene then forced to travel thru a desert

So the first thing I remember is they were having a get together/ party outdoors and someone mistakenly puts wet cat food on the table and someone eats it with a cracker. Next thing I remember is a shooting scene, most people at the home are killed and I remember a younger person hiding and seeing all the blood shed but is unharmed. Then they are forced to travel through a desert? I believe it was a young girl and a boy traveling, at one point they dig in the sand and are able to find water and then at some point the come upon a cave. The end of the movie is them finally being rescued or finally crossing the desert. Please help I think about this movie all the time it’s been driving me crazy for years!

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