We are going to SSS at the end of June, it will be our first Mexico/AI vacation ever. This may be a silly question, but one tip I've read about AI's many times is to bring your own reusable cup for drinks. I've read some resorts use little plastic cups for their drinks. Is this true at SSS? I'm not so concerned about drink size, but would rather have something reusable if possible. If they have real glasses they wash, then we probably wouldn't bring our own.