Can you buy some flowers to place on the graves tomorrow on your way home?
You don't servant something... but what do servants do? You are their god, so they have to make an offering to you every day.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. It shares its reading with the word 備える, which you learned a level ago, but in case you need a reminder, here it is:
You have to provide your friends with their own sauna (そな) because they don't want to use your shower. This requires you to go out and buy a sauna for your house (very expensive) just so you can provide your needy friends with what they want (a sauna). Feel angry you have to provide this.