I need a healthy weight gain diet, I eat alot and I like good foods. so i need the best diet to keep healthy so i can live a long time and all that good shit and i need to gain weight fast

well i have a succesfull weightgain plan so far but another thing i wonder is if im should be using this much water,
well i keep a healthy weight gain diet that is working for me,
i use 3 litres of water everyday i also uses juices,should i be using all this water?should i cut it down? or it it good?please let me know

I am an 18 year old male who weights 152 lbs. and wants to reach 170 lbs ASAP. I have a lean muscular build. What are the most healthy weight gain diets for this.