I've had my Spathiphyllum wallisii for three years now, and I'm still figuring out the watering sweet spot in my desert climate

I've had my Spathiphyllum wallisii for three years now, and I'm still figuring out the watering sweet spot in my desert climate. It's finicky about tap water here—I switched to rainwater last summer and the leaf tips finally stopped browning. The dramatic wilting when thirsty is actually helpful; I've learned to trust that signal rather than a rigid schedule. Anyone else in an arid region struggling with these, or is it just me battling the mineral content?