You're fussing too much. Orchids are tough, sturdy plants when conditions are right.
Tap water will be fine for all the plants you have mentioned, unless you have very high levels of dissolved minerals. Don't use a spray bottle to water. Don't water along the edge. When you water, run a large amount of water through the entire pot to soak all the media, then drain dry. When all the medium inside the pot is nearly dry, it is time to water again; not before.
I am surprised you think you need to water more often than every few days. The exposed roots will dry before the roots in the medium. Most orchid roots are not harmed by drying out. The roots inside the pot stay moist longer, and that is what matters. I might guess the Den. kingianum medium inside that pot could take 10-14 days to dry completely. When it begins to grow and make more roots, it will use more water, and the watering interval might decrease. You can use a wooden cooking skewer inserted into the medium to check for interior moistness. Almost nobody needs to water house plant orchids daily. They don't dry out that fast.
Don't worry about keeping water out of crowns. Phals are sometimes bothered by this, but in your lower humidity climate it likely evaporates within an hour, right? If it doesn't, I would just blow the water out of the crown with my lips and lungs. None of your other orchids worries about water in the crown. You could take them into the shower and spray the whole plant to water.
Roots absorb water. Stems and leaves don't. Spraying stems and leaves doesn't help orchids. In high-humidity areas it can promote fungus, but I don't think you need to worry about that.
The roots will grow when the plant is ready to grow. Almost nothing you do will affect that. Some of us use a kelp product to promote root growth, but it won't grow roots until the plant is ready for it.
Dry winter rests aren't what makes most deciduous Dendrobiums flower - cool to cold night temperatures is what does the trick. Most of them in cultivation need some winter water. The two Dendrobiums you showed usually flower in early spring, before they grow. It is unlikely they will flower before spring 2021. The oncidiums typically flower with each new growth, so you may still see those this year. Phals tend to spike in early winter.
Fertilizer is the least important factor in growing orchids. It doesn't help orchids unless other conditions are correct. It is no longer believed changing fertilizers promotes flowering, but fertilizer manufacturers are happy to sell you as many different kinds as possible. People do things differently, but I don't fertilize my orchids unless they are actively making new top growth. I would not fertilize either of those Dendrobiums, or the Oncidiums, until they begin to make a new shoot from the base. Phals tend to be in constant growth during warm weather, so I would fertilize that.
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