Guy,
It doesn't really matter that much...I aim for room temp but whatever comes out of the tap is fine for me...(I have had to use freezing lake water and hot tap water but I would try to avoid extremes)...as for the quantity...I use a 60cc syringe but sometimes I need to irrigate up to 5-10xs during one go because things have thickened up too much in there...no rule...If things are liquidy and pour right out I don't need to at all...it all depends on what you ate, what you drank and what your pouch thinks of both...you will learn as time goes by what you and your pouch need...
Sharon