I have some very lucky Lucky Bamboo. My neighbor gave me 4 little pots of the bamboo 5 years ago..now they are 5 pots. ALL I have ever done is keep them topped off with bottled water…they are in a garden window facing southwest. They are thriving..but the roots are growing out the top of the  little pots…all of them are completely full of root. I did move one tall curly guy downstairs because he got too tall for the window. I don\’t want to lose them, but they need to be repotted, and probably given some food once in a while. They are in containers between 1 1/2\” to 3 1/2\”…I am amazed they have flourished for so long with so little attention..but I love them. Any suggestions? Thank you, Cheri Moore