ADHD

Excelldnt service.

Yes. Some high end brands in the hotel available , but like the rest said , shopping available nearby as well..

If you mean the Marina Bay Sands Casino, it's 2 stops via MRT (incl. 1 transfer). We walked leasurly around the bay, stopping at Merlion and other places, ended at the casino after almost 2 hours. Enjoyed every minute!

Yes the facility is accessible

Water is readily available....although I am uncertain what is a muslim shower and therefore cannot answer that question. Perhaps you can explain?

Yes. It is a 1 minute walk and is covered so that you will not get wet from rain.

Aboug a mile.

Yes