That sounds like an interesting project. Here are some possible ways to represent nitrogen-infused soft drinks visually:

You could use a stylized letter N with bubbles or fizz to suggest carbonation and nitrogenation.
You could use a blue or green color scheme to evoke the natural sources of nitrogen, such as the air or plants.
You could use a lightning bolt or a spark to symbolize the energy and excitement of the product, as well as the role of lightning in fixing nitrogen from the air.
You could use a molecular structure of nitrogen gas (N2) or nitrate (NO3) to show the chemical composition of the product.
You could use a wordplay or a pun on nitrogen, such as “N-joy”, “N-tense”, “N-vigor”, or “N-fuse”.
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