Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
1- I don’t know where you got this idea of washing testicles in the case of madhy. When someone asked the Prophet (peace be upon him) about this, he replied, “It is enough for him to wash his genitals and make ablutions.”
Dhakar is the word used in the hadith; it refers to penis only. So, one is not required to wash the testicles unless there are traces of madhy on them. There is no need in indulging in hair-splitting. The prophet warned us against rigidity in matters of religion. He said, “Woe to those who practice rigidity!” And, “this religion of ours is simple and easy to follow; whoever makes it hard will only be destroying himself!”
2- If someone drank water or consumed something by mistake, it does not invalidate one’s fast. The Prophet (peace be upon him) said, “Allah has excused my ummah of their mistakes due to forgetfulness or being coerced into.”
Allah Almighty knows best.
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