Some NV laws to keep in mind...
It is legal to transport an unloaded firearm in a locked container.
It is legal to open carry a loaded firearm.
Conceal carry of firearms requires a valid CCW permit.
It is legal to have a loaded handgun in a vehicle without having a valid CCW permit, as long as it is not "concealed upon the person".
"conceal upon the person" includes portable containers on or near a person.
Examples...
It is legal to have a loaded handgun in the vehicle's glove/utility compartment, in plain sight on the seat next to you, on the vehicle's dashboard, under your seat, in a holster on you in plain sight.
Without a valid CCW permit, it is illegal to have a handgun concealed on you, concealed under you (you sitting on it) or loaded & in a portable container (purse/case/bag/pack/etc).
It is illegal to have a loaded rifle/shotgun in a vehicle.
This means no loaded chamber, but loaded magazine in firearm is legal.
Posted "no firearms/weapons" signs have no legal weight; unless they are posted at the entrance to a Gov owned/operated building, school/university, airport or child care facility.
However, businesses can ask you to leave their property for whatever reason and failure to do so can result in a trespassing citation.
Your BAC needs to below 0.10 in order to legally possess a firearm.
There is no "drunk in public" laws.
But, if you can not take care of yourself or have people to take care of you, you can be taken into custody for your safety.
But, if you have an attitude towards NV LEOs, they can arrest you for being a "public nuisance" (misdemeanor).