I have two questions. I am going to get a quinea pig(not sure if we are adopting one or two yet...its going to be a surprise, but I kind of found out about it) and I have already done a lot of research. The first question is concerning water, is tap water fine? Should I test the water to make sure it doesnt have too much calcium or minerals? And the second is how should we go about introducing the guinea pig/s once they have gotten used to their new home to our little mini dachshund, Mina?