I am very worry and need and urgent advice before the something happen to someone again.

On Saturday 08/07, my wife, my son (2) my aunty and I were traveling to Calais using Euro tunnel. We were supposed to board for the 13.50 trains going to Calais, when doing our checking at 13.33, the automatic machine advice us that it was too late and we should be taking the next train. We then went to the boarding gate. While waiting, my son saw a banana just across (SNACK BAR) where we parked waiting to board. I then went to get the banana for 50p. My wife and my son follow me and asked for a drink (Ice tea) the lady then served us for the price of1.50P.i first gave her 50p and then took it back I handled £2.oo coin to her.

While waiting, my wife sat down and open the ice tea bottle, drink and give some to my son, few minute late, we were called to board, on a rush she close the bottle and rush in the car and put the bottle next to my son.
When we get to Calais, we want to put some petrol in the car, we went to CARREFOUR, while she was filling the tank, i went to get some biscuit for my some. On a sunny day like that Saturday, my son did want to drink, so my wife took the ice tea bottle and give it to my son, suddenly my aunty saw some kind of strange mushrooms, weeds in a drink, and ask my wife to stop. We can not exactly describe how this looked like. We still have the half ice tea bottle with this weird stuff in it and I would like to know what should we do.

I scare, something might happen to my son and wife.