Reverse osmosis de-mineralized water(not spring water) is $2-3 for a 18-19 litre jug and will not leave hard water deposits on the glass and will not expose your snake to chlorine.
Personally, that is what I use for humidity and the water dish.
While you are at Walmart getting the scale you will probably find the Accurite indoor/outdoor thermometers to be a good tool in ensuring a comfortable habitat for your snake and considerably cheaper than pet specific ones.
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