何(なに)か飲(の)み物(もの)はいかがですか。

This is a polite offer. "何か" (nanika) means "something," and "飲み物" (nomimono) means "a drink." "〜はいかがですか" (~wa ikaga desu ka) is a very polite way to ask "how about...?" or "would you like...?" Common in hospitality.

相手に飲み物を勧めるときに使う丁寧な表現です。「〜はいかがですか」は「どうですか」の丁寧語です。