About how much backwash is in a bottled bevarage during or after drinking?

Question

I know this may seem super retarded but its 4am during a long graveyard shift and a few of us are debating!!!

Answer 1

I heard it was a third, but who knows lol... At least it is your own backwash..

Answer 2

Objectives/Goals

To determine if drinking a water bottle after excercise with either a straw or by mouth will contaminate

the remaining water in the bottle with bacteria from the mouth.

Methods/Materials

After one hour of excercise, I asked 15 subjects to drink from a water bottle, once by mouth and once by

straw. The subjects were asked to drink 3/4 of the water in the bottle. A one milliliter sample of the

remaining water was removed and poured into the culture medium. After 48 hours at room temperature,

the colonies were counted. A control was taken.

Materials:

Petri dishes

Culture medium

Calibrated dropper

Straws

0.5 liter arrowhead water bottles

gloves and mask

marker

magnifying glass

Results

100% of the 30 samples (15 by mouth and 15 by straw) grew bacterial colonies on the culture plates. The

drinking by mouth method contaminated the water bottles more than the drinking by straw method.

Conclusions/Discussion

I concluded that drinking water by mouth or by straw will contaminate the remaining water in the bottle.

My experiment suggests that the way you drink the water will effect the amount of bacteria that is

backwashed. Sharing other people's water, after sporting events, will expose you to illnesses from their

backwashed bacteria and viruses.

Answer 3

i heard it was about 1/4

but i'm not sure