If it is symptomless, you do not need treatment because the bacteria are not causing any harm.
Drink plenty of water and juices such as cranberry juice which is one of the best home remedies to combat against urinary tract infection.
Boil 25 grams of raisins in 250ml of water until water reduces to half the original volume. Have the mixture twice a day with sugar. This is one of the most effective home remedies for UTI.