What you eat or drink can change the texture of your sperm. Normal sperm can include chunky, clear, white, gray, thin. It can also change if someone ejaculates more often or less often as well. It's when there is an odor, burning, or pain or tinted with blood is when there is time for concern: Other wise what you are describing is normal.
As far as taste: Kiwi, watermelon and celery are all said to lighten the taste of semen.. Plus, blueberries and cranberries, pineapples can give a sweet taste.
Some things to avoid are coffee, beer which can give a bitter taste along with Dairy products.
So set him up with plenty of fruits for a couple of days and go from there.
Hope this helps, If you need anything else please feel free to ask. If you found this helpful don't forget to click the *ACCEPT* button and leave *POSITIVE* feedback.
Although eating or drinking fluids may help with changing texture, it won't change it enough to allow just a milky texture. Semen is "normal" when chunky, sticky etc., as this is what allows the sperm to stay inside a woman better so that conception can occur. So to turn it all over to just a milky substance won't occur. If men generally go a long time between ejaculating, there can be more of a build up of being chunky/stringing etc vs someone who ejaculates more often.
Some people say taking Zinc and Vitamin E is good to help, but do remember normal semen will and should be chunky etc.