Phalenopsis parishi new leaf with weird pitting

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Even a small Phal like this in good health will easily last 10 days without water, especially if in a mini terrarium.

I'm not certain that is mite damage, but it could be. No need to wait for oil to treat. Plain water controls mites as well as anything else. Use a spray bottle and spray every surface. You can also spray with rubbing alcohol, 70%, or a tiny amount of dish detergent in water.

Water kills spider mite eggs. Spraying your plants with plain water every 1-2 weeks prevents attacks..