For good gaming, my needs are simple: a notebook and something to write with. That’s all I NEED to come up with an evening’s entertainment. Now, depending on the game, I might have to consult rulebooks (especially for monsters), but I’m not sure that counts for the purpose of this question.
I don’t NEED minis, maps, sculpted terrain, a fancy table, form-fillable character sheets, etc. I like to have many of those, but they’re not essential tools. I suppose good friends and a comfortable gaming environment are very useful, but I wouldn’t call those essential tools.