i live in the tropics and from years of dealing with humidity this is what i do and suggest you give it a try.
if you only have a fan room, take your gear out of your bag and put your gear where there is constant air circulation. never put your gear in a dark place with no circulation for extended periods.
if you are in AC then if possible put your gear in a room that has no AC and a fan. if it must be in AC, i put my gear in the bag so there is some insulation between the AC and my gear. then an hour before you head out, turn off the AC, take the gear out of the bag, and open windows. this allows your gear to slowly acclimatize.
i never use silaca gel, but there is no reason for this, i think where i am it's too humid for silaca gel to have a real effect, but that is just my guess.
from my experience i think the two most important things are air circulation, and slow acclimatization from AC to warm with an emphasis on air circulation. also consider some lenses mold up faster than others, fixed focal lengths i have noticed seem to get moldy more often than zooms, my guess is that the zooms create a vacuum when you move them, thus giving air circulation. that is only a guess though.
if you are only in humid conditions for a month or so, i don't think you have too much to worry about though.