Certified GKH Gardening Expert
Unfortunately, once peat dries out, it will not be easy to rehydrate. You will need a surfactant to re-wet the peat. Coconut oil mixed with water, as best as it will, can help the peat to re-wet, being a surfactant itself.
For this reason, many people choose to use coco-coir and phosphoric acid to bring the pH down to the same level as peat will be, if you need that pH drop.
Once you are able to re-wet the peat, it is important to never let it dry out, or it will become hydrophobic, once again.
This article will help you to understand the benefits of coco-coir: