MIL keep asking to give baby water

Just want to rant. Annoyed at how MIL keep asking me to give my baby water. Very damn annoying altho i already told her SO MANY TIMES baby below 6 months cannot drink water, only milk. Whatsmore, my baby is only 2 months. When baby is sick or hiccups she keep asking to give baby water. Which i obviously have to keep repeating myself cannot. Old people forever with their olden days or old days. Partly why i don’t trust her taking care of my baby alone, who knows what she might do to baby behind my back.