Re: keto acidosis - quite unlikely. I’m on 25mg empagliflozin and also roughly 4 hour feeding window, lean, exercise. In fact, even 36-48 hour fasts have not pushed me into KA. I think in clinical experience KA happens only if you concurrently use insulin or insulin stimulating drugs; additionally, there are special circumstances where it is recommended you stop SGLT2i for a time, such as a few days before major surgery.
Urine output is increased transiently with the initial introduction of an SGLT2i, but then returns to norm - it is not a diuretic. However some people (DeStrider here) report greater thirst and increased fluid intake. Increased thirst is not a common response, but increased fluid intake is recommended precisely because you may want to dilute the sugar being lost in urine.
Yes, if you have some urine track vulnerability to the presence of sugar, obviously an SGLT2i will put sugar in that pathway. UTI and genourinary infections (especially mycotic) are a definite risk factor with these drugs, so you must evaluate carefully whether you are a candidate. Some SGLT2i have higher infection risk than others, and all are higher for women than men (and for men, slightly higher for uncircumcised compared to circumcised).
That said it’s an individual decision. Do the pros outweigh the cons? Only you can decide, perhaps in consultation with a qualified physician. They’re great drugs for sure, but like all drugs not risk free. I thank my lucky stars that I can take empagliflozin and it is available to me, but obviously everyone’s situation is specific to them. Best of luck!