"I have water in the glass."
"ho" means "I have". It is the first person conjugation of the verb "avere", which means to have.
Your articles are incorrect here. You put "nello bicchiere" instead of "nel bicchiere". nel is a combination of the words in + il. (Similar to conjunctions in english--how they and are become they're) Nello is a combination of in + lo. The correct article for "bicchiere" is "il", hence why you use nel.
thank you so much you are a savior. i have another question for you. are all verbs mainly masculine??? cuz i did a sentence and it was a girl but it still had a masculine verb...