Well if you're using someone's house, why not also try to get them to do the lighting of the tinderbox with the incense? Saves you quite a lot of space in the long run and time if you're not worrying about that. The only issue is finding someone who would be willing to do such a thing, but hey, if you have a friend who is willing, don't knock the offer. :P In short, I personally would get my own altar just because it helps me always remember just how much I exactly need to bring with me when doing bones. :)