“1) why do we pour water from becher into wine bottle before kiddush?”
The reason I’ve heard (I believe from R” Belsky Z “l) is that during the time of shas, wine had to be diluted as it was thick syrupy and high in alcohol content. so much so that pouring cup is often described as “mozgin” literaly – diluting.
Today in a nod to Talmudic practice we too are “mozgin” the wine before kiddush
#2 sounds made up