It’s hard to see the type of ceiling in your photo.

If you are looking for basic ceiling tiles for a drop down ceiling, they are available in different colors including black.

It looks like wood slats but IMO the fact they covered the lighting is not a good idea for an entry .If you look at suspended ceiling panels there are some very nice ones and combined with small LED pots look quite nice I certainly would not do black ceiling in a spa environment.

You’re not putting in real wood in a suspended ceiling. The weight would overwhelm it and it would crash down, with a big insurance claim against you. It’s also a fire hazard. Again, a huge claim against your insurance as a professional. If you aren’t insured? That goes straight to you to pay the millions.

If you have never designed for a commercial space before, you are out of your depth. There are a lot of rules and codes that need to be accounted for. Starting with it’s bad business to kill your customers.

https://www.houzz.com/photos/query/drop-ceiling/p/18

Inspiration if not installation instructions.