Off grid considerations

[Kyle Rucker]

Looking to do an off grid glamping setup and trying to find out what options I have for things like water, sewer waste, and solar power.  
I’m trying to determine how much and what it would take to go full glamping with a mini split and water heater and shower or if I go with a simple camp shower and composting toilet and maybe a small solar panel for a sting of lights and a place to charge phones. 

Are there websites that help me know how much power I need based on what things I have?

I’ve seen people have water tanks for water   I would love to have a resource I could look into on how those are setup.

Also I would like to know about waste water options if sewer and septic are not an option.  

Thanks in advanced. 
Kyle