You can speak, read, and write Common, Primordial, and one other language that you and your DM agree is appropriate for the character. 

Your Constitution score increases by 2 and your Wisdom score increases by 1.

Blightwater Genasi mature at about the same rate as humans and reach adulthood in their late teens. They live somewhat longer than humans do, up to 120 years

You are a Humanoid.

Blightwater Genasi are generally built like humans, standing anywhere from 5 feet to over 6 feet tall. Your size is Medium

Your walking speed is 30 feet, and you have a swimming speed equal to your walking speed.

You are able to breathe both air and water.

You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray.

Once per short rest you build the heat within you and release a wave of black water in a 20 ft. radius. Any creatures caught within the radius must make a save versus your DC (8 + your proficiency bonus + your Constitution modifier) or take 2d6 of Fire damage and have their movement rate reduced to 0 until the end of your next turn or half damage on a successful save and no reduction in their movement rate.

You gain resistance to Acid Damage

You know the Acid Splash cantrip. When you reach 3rd level you can cast Purify Food and Drink once per short rest. When you reach the 5th level you can choose to cast either Enlarge/Reduce or Acid Arrow once per short rest. Constitution is your spellcasting ability for these spells.