Potting Media Question, and Watering

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Hi Onc Alliance people. Wanted to post this question here, as it was most appropriate. I just passed a huge test at school, and I obviously splurged at the local nursery. They had two great Oncs, an Everlasting and a NoID, and they were on sale. They have plenty of blooms, the roots look good, and they seem to be potted in a medium/fine grade bark, as they both have tiny roots. This media seems to dry out really quickly, so I'm perplexed on how to properly water them. Should I just water them more often, more like 2 times a week, or should I throw on some spahg on top of the bark to hold some water until the next watering. I dont want to overwater, but at the same time I dont want to underwater them. Thanks for any Advice!