Growing outdoors without watering?

Hey guys im new to growing and have done a decent amount of research now but still havent found some info i need.
Ive always wondered if theres really a way to plant your seeds, leave your area and come back a month later with your plant still alive and growing.

Is there a possible way to germinate seeds, and plant them near a water source (river, creek, stream, etc) and not have to come back every few days?
I have a full BC mountain to grow on full of great water sources but i can only come back every about 3-4 weeks.

Any advice will be greatly taken!

If it rains they will grow just fine.

The location of the grow up is about an hour away from invermere so not near the coast or anything.
Apparently is rains a decent amount there but if it does get dry will it help if i plant the seeds near a water source? Or could it drown the root system?

build a self watering system of some sort, use your stoned brain