Can I get away with bringing less than a month’s supply of my 90 day prescription?

Hello! I need to take my SSRIs (escitalopram) on my 29-day trip to Japan, but the bottle I have from my doctor is for 90 days worth of pills. In the past when I visited for 2 months, I had to prepare an import certificate/Yunyuu Kakunin-sho for this particular prescription, but I understand that this isn't required for less than a month's worth of these meds.

Do you know if it would it be acceptable for me to just remove the pills I won't need from the 90 day prescription bottle, or should I try to get a new 30 day prescription from my doctor? Is there somewhere official I can email to get an answer about this?

Thanks 🙂