Is there any home remedy for a uti?

Not really. The old wives tale of drinking a gallon of cranberry juice bears some merit, but the gallon is more important that the cranberry part. Above and beyond that, antibiotics are superior to most homeopathic cures.
Boost immunity. Lowered immunity can cause frequent UTIs. Taking a zinc supplement 25-50 mg/day, Vitamin D3 10k IU/day, and a good probiotic daily might help solve the problem since they boost immunity and reduce inflammation.