I’m new to OC(attended services for couple of months) and last time I was chastised by one of the ladies who saw me taking a sip of water during service. I have a chronic medical condition that at times, makes me feel nauseated and dizzy, so I usually keep a small bottle of water handy in my purse in case I start feeling sick which is what happened last time. When I mentioned my situation, this lady said that if I feel the need to have some water, I should step outside since they don’t allow any drinks inside.
Is that correct?
Not really. We don't have coffee during services, just after, but most Churches have Holy Water to drink, for instance.
If it is possible to step outside to drink, then do so just as not to make a scene. If not, if you get too nauseasted and dizzy too quickly to step out, then by all means take the sip. If something is said, mention it to the priest.
I’m new to this and not sure of all the customs. I was rather embarrassed to ask my priest about something so trivial unfortunately, its also embrassing to step outside every time i need a sip of water. What should i do?
If you can sit near the exit, do so. If, however, you are still learning and want to follow up close what is going on, that takes priority. There is no mortal sin drinking in Church, in particular for a medical condition.