Chile plants don't really need a lot of help in making fruit "set", as they are self-pollinators. If you are growing indoors, once the plants begin to bloom, you can a) give the pots a good thumping - enough to shake the plant, b) run a fan on them (ideally, oscillating), andor c) just run your hands through the foliage every day. A fan is a good idea for another reason: it helps prevent the top-of-soil fungus (known as "damping off") from occurring. Damping off can kill your plants. Plus, the breeze from the fan will ensure pollen gets moved.Â
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Regarding spraying with water, lots of folks will tell you to just spray off mites and such. That only temporarily helps. If you get mites, better to use an insecticidal soap or, in cases of infestation, a miticide.