If you never had a stone before DS you *probably* have nothing to worry about. Stone formers are genetically different. (Maybe you never knew you are a stone former - there's always the first time.)
For stone formers, Vitamin C intake above 1000k has a direct link to stone formation, as does protein intake > 1 gram per kilo of body weight, as does sodium intake > 2000 mg, as does low calcium intake, low potassium citrate, high oxalate intake, as does SUGAR. (Geez you do NOT wanna be a stone former.)
Then we stone formers go and get a DS and the malabsorbed fat binds with calcium, calcium which was supposed to bind with oxalates, and oxalates end up in kidneys forming stones. And we have reduced the length of the water-absorbing small intestine meaning urine and all the nasty stone forming bits gets concentrated.
As for potassium citrate (not the same as vitamin c) which also binds with oxalates, OTC potassium citrate is not very potent. It would take 10-11 tabs to equal ONE prescription strength tab, and most stone formers need several prescription strength tabs. Please consult University if Chicago urology site for research into beverage alternatives, like Crystal Light Lemonade and diet Sprite/Sierra Mist/7up. These really are a viable alternative.
All my numbers are good (oxalates, urine calcium etc) and yet I started passing stones 9 months post DS. The ONLY thing amiss was low urine volume meaning I was not drinking enough.
Let me hammer this home: the #1 thing you can do to prevent stone formation (in stone formers and especially in DSers) is to drink enough fluids to produce 3.25-3.5 liters of urine in 24 hours - that's about 105 ounces for a woman if you don't sweat a lot. Yes that's a lot and yes you will need to get up at night to pee which is a good thing. But far better than the excrutiating pain from stones.