By definition, most bottles have a bottleneck, making it difficult to clean the insides. But this JuNiki bottle from Germany has a wide, can-like lip, making it easy to get in there with a sponge. Furthermore, the dual-neck cap that screws on top of it makes the bottle both easy to fill and easy to drink from:
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The bottle has already been successfully Kickstarted, with just €10 (about $12 USD) getting you your choice of a borosilicate glass version or a vacuum-insulated stainless steel version. If you want one, you'd better hurry--there's just five days left to pledge.