Is anyone else prone to water infections more since escorting?. Is there any precautions that can help safe guard against this during bookings?. Although trying my best but it's still happening.  Any helpful suggestions appreciated.

No.

I do remember having cystitis once in my late teens and wouldn't wish it on anyone. The cranberry juice cure everyone trots out isn't supposed to be actually as miraculous as it's made out to be. I would guess that usual stuff re avoiding mixing fingers from back to front, not using harsh soap products, making sure you have enough lube and don't allow rough handling would probably be the recommendations.

My doctor said that there are some studies into the contraceptive pill making girls more prone to urine infections. Could be true as when I came off it my constant cystitis vanished.
Also pee immediately after the booking has finished as it will wash the bacteria away from being fingered etc.
Drink lots of water and try and avoid caffeine, too much alcohol because it can make your body too acidic which will result in the burning pain.
Cystitis
And finally there's a product called d-manosse which you can get from health shops and online at amazon and if you check out reviews it's meant to work wonders for people who are prone to cystitis.
Rough fingering seems to give me them so I now tell clients when they begin that I like it really gentle and slow and not too deep. Haha

Are you sure its a UTI/water infection?

I had those symptoms and had STI tests which came back clear as well as tests for UTIs, which also came back clear, after seeing a urologist they found out that I have the symptoms of cystitis if I drink fizzy drinks and fruit juice (my top triggers), it's like pouring acid into my bladder, tea and coffee can also do this as can chocolate and spicy foods and it came on with me all of a sudden, if all your tests come back clear it is worth looking at. (google a condition called interstitial cystitis)