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Newly planted shrubs need regular good soaking, especially if they were planted in the summer. They would have been better off if you had waited for cooler conditions as hot summers and drought are not an ideal time to plant these. A drip may not be adequate enough to reach the roots while they are trying to get established. They must receive plenty of moisture during the growing season and be watered more frequently and deeply during drought and hot summer conditions. The soil on top may be moist but what does it look like at the root ball? Did you add anything to the hole when planting to loosen up the soil so that the water can reach the roots?
Once they are that brown, sadly they won't recover their green.
