General:
* In over your head: To be in a situation that is too difficult to handle.
* Fish out of water: Feeling uncomfortable or out of place in a new or unfamiliar situation.
* Go with the flow: To accept things as they happen and not try to control them.
* Like water off a duck's back: Not being affected by criticism or insults.
* Stir the pot: To cause trouble or conflict.
* Still waters run deep: Someone who is quiet and reserved may have a lot of hidden depth.
* Water under the bridge: Something that has happened in the past and is no longer important.
Money:
* Make waves: To cause trouble or change things significantly.
* Spend money like water: To spend money carelessly and without thinking.
Other:
* To throw cold water on something: To discourage or oppose an idea or plan.
* To muddy the waters: To make a situation more confusing or difficult to understand.
* To keep your head above water: To manage to survive financially.
* To be in hot water: To be in trouble.
* To make a splash: To make a big impact or to be very successful.
* To sink or swim: To succeed or fail based on your own efforts.
* To be a drop in the bucket: To be insignificant or unimportant.
* To test the waters: To see how people will react to something before taking action.
* To be on thin ice: To be in a dangerous or risky situation.
* To break the ice: To make people feel more relaxed and comfortable in a social situation.