I understand your concern, and also appreciate your thinkng but I would like you know that there is nothing like healthy or unhealthy sperms all that a male can have are sperms since only one sperm is enough to cause pregnancy. Certainly their count vary from person to person depending upon theit lifestyle and sexual life. There is should be mutual understanding between you and your wife for this. You alone being healthy won't help this applies to your wife too.
Coming to the food that you have asked for any healthy food will do and have 2-3 liters of water and can have any coloured fruit