Little problem,outdoor

Hello,in the last 2 days one of the heads of my ladies started having problem, can you please help me?The first picture is my problem and the second is the head of a plant doing well right next too it.(Forgive my pitiful english)

well, the poor leaf color is likely PH related and the bud is getting attacked by mold. Get a fungicide and ignore the leaf cuz it's too late. But use PH balanced water.

Well I took off the brown part of the head , about fungicide can it be buy in an hydroponic store?Is there any kind better?About the ph of my water , I'm using water of my sink to water the plant is there anything special I can do to regulate the ph? This is my second experience I'm new to cannabis growing.

Yes, get a sample of your water and take it to the store with you and ask the guys to balance it for you say, one liter. Wach them do it. By the product you need to balance your own. The fungicide should be available, if not go find a "vegi fungicide" that's safe to consume from a nursery...

You can get better stuff online but right now you need to get that fungicide pronto!!! Go! latz -t