My very favorite cup is the Tervis cup. I carry mine with me everywhere, my drinks stay cold or hot because of the double walled insulation. It is made from safe materials unlike a lot of plastics out there. There are many to choose from in all categories. There are ice buckets, tumblers, coffee mugs, sippy cups, accessories include straws and lids, something for everyone. Even cups for special occasions such as the upcoming Father's Day. My cup is the one below that I bought at the beach last year. Amazon has a wide variety of them of course. I plan on buying more.
The Sippy Cup is so cute!