Boil in a kettle, microwave, or get hot water from your Keurig. For teas, I love Teavana and they have tons of accessories. This is what I use. I keep it at my desk at work along with a tin of tea. Sure, a cute little teapot would be adorable but it's just something else to clean, and they're heavy as crap. If you just want a cup of teat this is great.
http://www.teavana.com/tea-products/tea-makers-infusers/p/teavana-perfect-teamaker