You don't worry about what the surface is doing. The plant lives farther down.

I am sure drilling the holes will help. Plant rarely do well in a planter without drainage.

Watering every day with no drainage holes and wilting plants .... hmm seems like a good setup to raise fish.

In a dry climate, having mulch helps greatly as it helps prevent the top dryness.

You didn't say what type of soil you have, but if you're willing to (or unable to stop) watering every day, go with the 5:1:1 mix Tapla suggests. If you think you'll burn out from watering every day, use a more peat based mix. In a dry climate a 5:1:1 mix can dry out very fast.

Defnetly too much watering and you MUST have drain holes.
Do these containers sit on the ground ?
If you can sit them on the ground so you have soil to soil contact(container soil in contact with ground soil )
this will allow any access water to flow from container to the ground soil and keep roots from being waterlogged and dying,as roots need air also,

WScott, ditto what everyone else has said. If your plants have wilted as a result of overwatering, you can bet all those tissues have been damaged. There may be parts that can recover, but usually the cells would have exploded from too much water and there's no recovery from that - especially if this has been happening over a long period. Try it again with new plants and make sure you have good drainage.