I bought this one over a year ago and still love it: Miro NR07G humidifier -... https://www.amazon.com/dp/B07781P8J8?ref=ppx_pop_mob_ap_share
It’s way more expensive than the ones you can get at the pharmacy, but you can take it all apart and just wash it in soapy water (and/or sanitize between washes).
Miro humidifiers!!!!! They’re pricy but they’re modular so you can easily take them apart and hand wash them!!! It is the best humidifier we’ve ever had and the fact that we don’t have to worry about hidden mold is worth it for that aspect alone.
Miro NR07G humidifier - Completely Washable Modular Humidifier, Easy to Clean, Easy to Use, Large Room - Cool Mist, Sanitary, Top-Fill Ultrasonic Humidifier with Whisper Quiet and Powerful Output https://www.amazon.com/dp/B07781P8J8/ref=cm_sw_r_cp_api_glt_fabc_B2QYV7G1FAKKE4TRSCQC
Main thing you want to do is KEEP IT CLEAN.
The only (countertop) one I've found that is truly cleanable is the pricy, but worth it, Miro.
Link to AMAZON: https://www.amazon.com/gp/product/B07781P8J8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
We got one that I can completely take apart to clean and dry. Miro NR07G humidifier -... https://www.amazon.com/dp/B07781P8J8?ref=ppx_pop_mob_ap_share
We use Miro NR07G humidifier -... https://www.amazon.com/dp/B07781P8J8?ref=ppx_pop_mob_ap_share I like that is comes completely apart for cleaning
A good humidifier. This completely washable one is great: https://www.amazon.com/Miro-humidifier-Completely-Humidifier-Ultrasonic/dp/B07781P8J8/ref=sr_1_3?keywords=miro+humidifier&qid=1565206037&s=gateway&sr=8-3