I also want to question, for anyone. I thought it was the environment of the vaginal cavity/cervical secretions that were the problem for sperm, not the uterus itself?
That is my understanding and a point that I did a horrible job of getting across. Maybe OP mistakenly mentioned uterus and not vagina? Anyway, I do not believe that lemon water will have any bearing on fertility, however I do believe that diet can affect vaginal pH.