<human>: This actually happened 5 minutes ago and I've retreated to a toilet to write this.

For a little bit of background: I'm a law student who is living at home temporarily while looking for affordable accommodation in my city.

Sometimes at night I like to drink the occasional wine bottle, but since my Mum lives at home I need to find places to hide them in case she decides to look in my room. One of the easiest places to hide the bottles is under my bed, and I recently had a collection of 4 or 5 bottles stored there.

Last night I was a bit drunk and didn't want to wake my mum up by using the toilet, so I pissed in two of the bottles so that I didn't have to make a sound by leaving my room. Disgusting, I know. 

Anyways, fast forward to this evening. I'd just been out playing football with my friends and was supposed to meet my mum at a family friend's house for dinner. I arrived, had a couple of beers and generally enjoyed my night.

Then, after dinner, as most of the drinks had gone, our family friend brought in a bottle of wine which my mum had brought as a gift. She tasted it and then allowed my mum to taste it, who both agreed that it tasted oddly like water.

My mum then informs the whole dinner party that she had found the bottle under my bed and had brought it along since she thought it was a full bottle of wine. 

I had to pretend that I keep them there in case I'm extremely thirsty at night and, so far, no-one seems to know that they just drank urine.

Summarize the given text in a few sentences.
<bot>: I pissed in some wine bottles and hid them in my room. My mum brought them to a dinner party and I just watched my mum and a family friend drink my piss