People who didn't have a problem are few and far between. I was told by my urologist that most men - and I - will regain full/fullest continence between 3 - 6 months. I only achieved that with Pelvic Floor Physical Therapy (PFPT) that started at about 14-15 weeks when I was really frustrated. I had to demand PFPT...it was never offered as part of routine post-op care, which ticked me off. I heard about it in this Mayo blog. I am now 14 months post-RP surgery and I am about 98-99% continent, but I still wear thin "Shields" for little spontaneous leaks. It is very frustrating.
An important part of PFPT is that, besides lots of various Kegel style exercises, they re-train you in your consumption of liquids. They trained me to drink a maximum of just 8 ounces at a time, and to drink that eight ounces immediately after urinating. You need to cut out bladder irritants, especially early in your journey, so...no sodas (acidic and caffeine); no alcohol; no coffee (acidic and caffeine); no orange juice or other citrus flavored drinks. So, yes...basically, I ended up drinking water almost all of the time. The unexpected bonus: my grocery bill went down without buying all of the sodas. I do drink about 6-8 ounces of low-sugar orange juice every morning (I am a Type I Diabetic). It does not cause problems with my urinary continence, nor my glucose levels. Good luck.