I cannot tell you how important it is to keep the kitten warm - use a small box, or one that will fit the hot water bottle or the heating pad, alone with a towel to cover those items - you can use a themometer and adjust the heat as described in the article I have given you.

Do put a fluffy toy in with the kitten... it won't feel so alone.

Don't get a fright to, if the kitten starts to deficate on its own inside its bed, this will happen too, but don't forget to stimulate it too. A kitten should urinate often, but in my experience, they only deficate 1 time a day, 2 times at the most in the first 1/2 weeks... there after it becomes more frequent.