Allow the spider to be somewhat dry before you water. They have the ability to store moisture in the bulbous like roots. Spiders like a high quality water, no Chlorine and chloramine. For just a few plants I would just use bottled water. Something like a Brita filter removes Chlorine and chloramine.
Your plant looks healthy and a occasional brown spot is fairly normal. Filtered water on the right schedule makes brown tips and spots a rarity.
I just started these in the past week. I can see new growth already.
