'słowik' is a kind of a bird :D As you have "w słowniku", then I guess also "w wikisłowniku" :)
"Both of the women drink tea" should also be accepted. English is fun like that.
The same way as you already did. What you meant will be evident from context. If you want to stress that they are doing it habitually, you can add extra words such as regularnie, codziennie, często... or you can use the habitual verb pijać instead of pić, which is however less common.