This alleged encounter, taken at face value, is actually far more mundane than people make it out to be.
A small group of people in a private vehicle with limited supplies get turned around and run out of potable liquids. Approaching a local, they gesture for water, and receiving some, offer a gift of food prepared on a camp stove as recompense.
Has nobody ever been in a similar situation?
Yes, the witness could be lying, mistaken, or a complete idiot. But how much more psychologically natural could an encounter with travelers be? People who are going about their business are usually too preoccupied to start vaporizing natives, or to demand audiences with local leaders.
Up until very recently, humans hand-picked the best of the best of the best of us for missions off of our planet. Once a whole civilization acquires the means to travel between inhabited worlds, whether via outer space, parallel universes, or ways that we can't even imagine, their ordinary folks get around too.
I often refer to the possibility of encounters with alien Beavises and Buttheads, but more likely still are encounters with alien Joe and Jane Q. Normal out on holiday. Quite a few alleged encounters smack heavily of banality. For example, the Lonnie Zamora sighting reminds me of a time when I had to get out and help push a car to jumpstart the engine.
How would YOU react when out of supplies in an unfamiliar place, and perhaps coping with engine trouble, and the local wildlife gathers around to watch your struggles?
Of course, extraordinary claims require extraordinary proof. This event remains unproven. My point is that the alleged behavior of the alleged travelers is perhaps the most natural part of the whole story.