Po turnieju każdy zawodnik i każda zawodniczka dostaną wodę i kanapkę.

and

Breakdown of Po turnieju każdy zawodnik i każda zawodniczka dostaną wodę i kanapkę.

• woda: the water
• każdy: every
• po: after

Questions & Answers about Po turnieju każdy zawodnik i każda zawodniczka dostaną wodę i kanapkę.

Why is it po turnieju and not po turniej?

Because po means after here, and in this meaning it requires the locative case.

• dictionary form: turniej
• after po: po turnieju

So po turnieju = after the tournament.

A useful extra note: po can take different cases with different meanings. For example, po wodę means to get water / for water, which is a different pattern.

Why does the sentence use każdy zawodnik i każda zawodniczka?

This literally means each male competitor and each female competitor.

Polish adjectives and pronouns must agree with the gender of the noun:

• każdy goes with a masculine noun: każdy zawodnik
• każda goes with a feminine noun: każda zawodniczka

The sentence explicitly includes both men and women. It is more specific than just using one general group word.

Why are każdy and każda singular if the meaning is about all the participants?

Because Polish often uses singular forms to express each individual person.

So:

• każdy zawodnik = each male competitor
• każda zawodniczka = each female competitor

This is a distributive idea: the sentence talks about what happens to every person one by one, even though the whole group is plural in meaning.