You would probably be able to get away with the opaque water bottle as long as you aren’t trying to take it someplace where those water bottles are forbidden. For instance, a sporting or concert venue might only allow you to bring such a bottle in if it is demonstrably empty, since that is such an obvious way to bring in a beverage that the venue would prefer to sell to you at 3-5x the normal price. And again, if you’re obviously intoxicated or otherwise causing problems police might take a closer look anyways.
Apart from the public drinking being a possible issue with what you describe about the public space parties, many jurisdictions have noise ordinances that would prohibit the loud music after a certain hour, often 10 PM. Usually only specially designated areas, like outdoor concert venues, would be allowed to make a lot of noise later than that. But again, for that to be enforced you’d have to be making a nuisance of yourself enough that someone would call the police. That’s the case with a lot of the laws: you have to be so egregious with it that you attract police attention or aggravate someone enough that they call the police.