Considering it's a synthetic version of normal blood, yes, I imagine the taste is the same. In regards to being worried about playing a Nekovalkyrja incorrectly though, don't worry too much - it's why Sif is there. Her whole reason to being in the story is to point out any mistakes or such that the younger ones around her may have, as well as to set a standard to strive for. It's the same role that Zero played in regards to Megaman in the game - they're a type of mentor character that serve as an example of what your own can become. Your characters are generally inexperienced after all, and like children, it's all too possible they don't quite know what's 'proper' or expected of them in certain situations either, and we all know there's nothing wrong with that.
It's a learning experience. Even if a mistake can't quite be handwaved away as inexperience on a character's part, we'd just bring it up in OOC and discuss it.
And, I know how crappy or non-existent internet feels like - good luck!