I have to say sage and thyme are the ones I kill the most. Unfortunately over and underwatering look pretty much the same. Really overwatering and the bottom leaves would be black.
Sage does not like a lot of water, but it does need it. When you water any plant, it needs to be watered well, not a cup at a time. Just water it until it goes out the drain hole. When the leaves curl and get crispy it is hard to save.
You can try and put the pot in a bucket of water. If the soil is really dry, it will be hard to wet evenly. Let it soak until the bubbles stop and then take it out and let it drain. No saucer. Remove the crispy leaves. If the wilted leaves perk up, it may have a chance, if not, then it probably won't come back. Water thoroughly everytime you water, but water as needed. Depending on the media and how fast it dries. You may have to poke in the soil and see if it is still moist further down. It should be almost dry before you water but if the leaves are wilting you waited too long. BTW if you over water the leaves will also wilt, so if it is wilting and the soil is wet, the roots are rotting.
Happy gardening in Hawaii. Gardens are where people grow.