Santa Carcossa Nights hint request

I’m stuck. I’ve

gone into the lighthouse and lowered the tides, I’ve discovered the bodies and watched as the acolyte applied whatever it is to presumably create marine snow, and I’ve picked up everything that isn’t nailed down, but have not found a way of using the flask, the matchbook or the cola. If there’s a way to get into the motel inner office or the back room of the souvenir shop, I have not found it, nor have I figured out how to ‘bend my will,’ although I assume it involves marine snow somehow.

Any help would be appreciated. Thanks.

Going from memory, but the way into the motel should be in a location in the lighthouse.

Good lord, I simply missed an exit. Sigh.

Thanks very much.