מי שרוצה להצטרף לטיול חייב להביא מים וכובע.

In this sentence, מי is not asking a question. It means whoever or anyone who.

So:

• מי רוצה? = Who wants?
• מי שרוצה... = Whoever wants... / Anyone who wants...

Here, מי שרוצה להצטרף לטיול means whoever wants to join the trip.

The ש־ is a very common Hebrew connector meaning that, who, or which, depending on context.

So:

• מי שרוצה = whoever wants / anyone who wants

If you removed the ש־, you would get:

• מי רוצה? = Who wants?

So the ש־ is important because it turns this into a descriptive clause rather than a question.

Hebrew often uses the masculine singular as the default form in general statements, especially with a word like מי when it means whoever or anyone who.

So:

• מי שרוצה... חייב... = a general rule applying to anyone

Even if the statement applies to women too, masculine singular is very commonly used as the default/general form.

If you wanted to make it explicitly feminine, you might say:

• מי שרוצה... חייבת... for a female person

But the original sentence is just the standard general phrasing.

להצטרף is the infinitive to join.

The beginning ל־ is part of the Hebrew infinitive form, similar to English to in to join.

So:

• להצטרף = to join
• להביא = to bring

This verb is from the התפעל pattern, so it is a reflexive-type form meaning something like to join oneself to.

Because the verb להצטרף normally takes the preposition ל־ meaning to.

So Hebrew says:

• להצטרף ל... = to join ...

Examples:

• להצטרף לקבוצה = to join the group
• להצטרף למשחק = to join the game
• להצטרף לטיול = to join the trip

So the ל־ before טיול is required by the verb.

In unpointed Hebrew, לטיול can be ambiguous.

It can represent either:

• לְטיול = to a trip
• לַטיול = to the trip

Usually context tells you which one is meant. In this sentence, English would often translate it naturally as the trip, but Hebrew spelling without vowel marks does not always show the difference.

This is very normal in everyday Hebrew writing.

Here חייב means must, has to, or is required to.

So:

• חייב להביא = must bring

Literally, חייב can also mean obligated or required.

It changes for gender and number:

• חייב = masculine singular
• חייבת = feminine singular
• חייבים = masculine/mixed plural
• חייבות = feminine plural

In this sentence, the masculine singular is being used in a general sense.

Because Hebrew commonly uses:

• חייב + infinitive

So:

• חייב להביא = must bring
• חייב ללכת = must go
• חייב ללמוד = must study

This is a very useful pattern to learn. After חייב, you usually put the infinitive of the action.

מים is one of those Hebrew words that has a plural form but usually refers to something uncountable in English.

So even though it means water, the word itself looks plural.

That is why adjectives with מים are also often plural:

• מים קרים = cold water
• מים חמים = hot water

So yes, it means water, even though the form is grammatically plural.

Because it means a hat, not the hat.

Hebrew often leaves indefinite nouns unmarked, so:

• כובע = a hat
• הכובע = the hat

So מים וכובע means water and a hat.

The sentence is giving a general requirement, not referring to one specific hat.

Because Hebrew, like English, usually puts and only before the last item in a short list.

So:

• מים וכובע = water and a hat

If there were more items, you would still usually only need ו־ before the final one:

• מים, אוכל וכובע = water, food, and a hat

Yes, very common.

The pattern is:

• מי ש... = whoever / anyone who...
• then a requirement such as חייב
• then an infinitive phrase

So the sentence breaks down like this:

• מי שרוצה להצטרף לטיול = whoever wants to join the trip
• חייב להביא מים וכובע = must bring water and a hat

This is a natural, everyday Hebrew sentence structure.