This is the 11524th most frequent Russian word.
достаточный
Sufficient.
The word 'достаточно' is used as an adverb here, conveying the meaning of 'enough' or 'sufficiently' to describe the availability of time for completing the project.
У нас достаточно времени, чтобы закончить этот проект.
We have sufficient time to finish this project.
The word 'достаточный' is an adjective in this sentence, qualifying 'experience' (опыт) to indicate the necessary or adequate amount of it required for the position.
Чтобы получить эту должность, у вас должен быть достаточный опыт.
To obtain this position, you must have sufficient experience.
Here, 'достаточными' is the plural instrumental form of the adjective 'достаточный', agreeing with the noun 'запасы' (supplies) and indicating adequacy for the expedition's needs.