
Pickles,
Like Daisy, I'm not a 100% sure what you mean

Is it simply a house-training problem where she is going indoors rather than in the garden? Or is she not going to a specific place outdoors that you're trying to train her to use?
Also she may have a urinary tract infection and so be partially incontinent or suffering pain when weeing and constantly feel the urge to go :( If there's the slightest chance that this applies (ie it's not poor training) she should be checked over by a vet as, left untreated, these types of problems can cause much more serious ones.
As to controlling her water intake - that is both dangerous and pointless - you will only cause any infection in her system to become stronger and add strain to her kidneys. Also there is a significant risk of dehydration :(
Can you please respond with some further details about your young bitch? You've asked for help and there's plenty folks on here who will be happy to respond if you can just clarify your problem :)
Regards, Teri