Learn Spanish (Latin America): Pon limón y jengibre en el agua y curas tu tos. - Put lemon and ginger in the water and you cure your cough.

This is a colloquial conditional structure. Instead of saying Si pones... (If you put...), using the imperative pon followed by y makes the sentence punchier and more conversational. It emphasizes that doing the first action will directly trigger the second.

Why does the second half use the present tense curas instead of the future tense curarás?

In this specific structure (Imperative + y + Result), you can use either the present indicative or the future tense. Choosing the present tense curas makes the outcome sound much more immediate and guaranteed, as if the cure happens the exact moment you drink the water.

How do I know the gender of tos here?

Tos (cough) is a feminine noun, making it la tos. You can't see the gender in this sentence because the possessive adjective tu is the same for both masculine and feminine nouns. If you wanted to describe it, you would use feminine adjectives, like una tos severa.

Could I use the subjunctive cures for the second verb since the cure hasn't happened yet?