だけで
Usage
N/V だけで is used to express the idea that just X or just doing X is fine or good enough, or that one can do something just with X or by doing X. "Just with -; just by V-ing; just V-ing (is fine/enough/etc.); just N (is fine/enough/etc.)
Examples
日本に行ったら、英語は使わないでなるべく日本語だけで生活するつもりだ。
When I go to Japan, I intend to live using as little English as possible and rely primarily on Japanese.
この植木は二週間に一度水をやるだけいいですよ。世話が簡単です。
This plant only needs to be watered once every two weeks. It's easy to take care of.