If possible, Carlos, it would be a good idea to test the pH of your well water. If the pH is too high, adding a little bit of vinegar to it when you water the orchids is a good idea, because the fertilizer elements sometimes are not available to the plant to absorb if the water is too high pH, or if it contains too much phosphorus (like my well water does). Water test kits are available here at pet stores that sell aquarium supplies, or you can also use a swimming pool test kit.
If you have the means to collect rain water, that is the very best water to use for watering and fertilizing orchids if your well water is not suitable. Just mix your additions into it and spray on.
Advise you not to use any fertilizer with copper in it, as some types of orchids are very sensitive to copper compounds like copper sulphate.
