Bad potting mix

[Astronomical_Orchids]

I got a new orchid to enjoy fresh blooms while my first grows a new stalk(one day). And after a week or so one of the leaves started drooping I googled leaf drooping and it said overwatering or under watering. I pulled it out of the container and I think I have the problem the bottling was incredibly dense ground up saw dust and that holds a lot of moisture. I'll post a picture I'm 90% sure it's suffering from root rot I pulled out the saw dust which was a challenge and am replanting it with the orchid mix I got for me first. I'm not sure what to do next. Please help. Also I don't think this was entirely my fault as I did not place the sawdust in it came with it.