I think It is about being in a relationship.
the "Please dont flow so fast". ( the relationship is going to fast)
"you little mountain hum" (the relationship)
" I'll take a bottle down to you" ( wants to bottle the realation ship, make it everlasting)
the same for next to stanzas.
The last line is saying that the partner doesnt have to do anything to gain her/his love.
I think It is about being in a relationship. the "Please dont flow so fast". ( the relationship is going to fast) "you little mountain hum" (the relationship) " I'll take a bottle down to you" ( wants to bottle the realation ship, make it everlasting)
the same for next to stanzas.
The last line is saying that the partner doesnt have to do anything to gain her/his love.
this is what I think it means