Keeping up the moisture

Best route would be a small humidifier However if your not using distilled water don’t have it to close to your plants they will leave a fine white powder dust on everything over a long period of time. You could get environment controls that would have the humidifier turn on at set points or temperatures which makes it pretty easy you just need to make sure it always has water. In a pinch I have used misting the plants a couple times a day (hard to keep up with) or you could place a bucket of water near a fan and maybe hang moist towels to increase humidity but again those are high maintenance twice a day rewetting them. Spraying the walls in a tent also helps increase humidity but these methods work best in an enclosed tent. Best bet go spend $30-40 on a humidifier and if you have a few extra $ look into environment controllers they are an awesome little tool I just added to my setup just set and forget and your temp or humidity is bang on consistent as long as u use right tools for the job meaning fans humidifier/dehumidifiers or heaters. Good luck nice job so far.