Unfortunately, each one that gets knocked down on its face means it's statistically more likely that the debunkers are right and the theorists wrong. We can go to infinity, but after ten or even 5 assertions wiped out with only basic experimentation, the chances of you having been right in the first place go beyond minuscule.
The problem is that conspiracy nuts don't understand statistics, or science. They are always asking for "proof" or "certainty" and in the the face of its lack they default to their own crazy idea.
But knowledge is not certain: it can always be updated in the face of new (possibly currently-unimaginable) evidence. So science, which creates knowledge, cannot create certainty of any kind. Not even falsification is certain, and people who ask for certainty are like alchemists of old, who rejected mere chemistry because it didn't give them the impossible capability of turning base metals into gold.
All that said, I have found it useful to ask Moon-landing-deniers who say, "The only source of light is the sun", "Then how can I see the ground?" If they acknowledge they can see the ground in the photos, they are pretty much forced to admit there is reflected light from the ground so they start looking pretty foolish when they repeat (as they often do) "The only source of light is the sun". It doesn't convince them of anything, but it does shut them up and make them go away.