It isn't unbalanced
The Genasi race from the Elemental Evil Players Companion, when compared with other races, isn't in the top third of 'power' assessments done by a variety of analysis. A recent assessment finds them all in the low to mid range, power wise. They range from Air (19) to Water (25) on the scoring there with the top races earning a (32). (I disagree with the vHuman assessment of 33, but that's not a concern for your question).
Detailed spread sheet is here.
I recommend reading the whole analysis, and some of the discussions in the linked thread. Each attempt by non-WoTC folks to assess balance between race choices has pros and cons. I think this one is a pretty thorough look, and the scoring is reasonable - but it's not the only approach that people use to assess how many features to have or not to have.
Compared to Water Genasi: close, but not as good
Ability Score Increase. Your Wisdom score increases by 1.
Your flexible ASI is better by a bit, and allows optimization approaches in more classes. Similar to vHuman and Half Elf flexibility. +1 to Chaos Genasi. Maybe +2, since that kind of character generating/building flexibility can allow you to his some 'stat sweet spots' across the board.
Acid Resistance. You have resistance to acid damage.
Yours has no resistances, but exhaustion prevention in some climates is comparable. A wash.
Amphibious. You can breathe air and water.
Yours doesn' have that; you have Survival skill. A wash, but it's also campaign dependent.
Swim. You have a swimming speed of 30 feet.
Yours has nothing. (+2 to Water Genasi).
Call to the Wave. You know the shape water cantrip (see chapter 2).
When you reach 3rd level, you can cast the create or destroy water
spell as a 2nd-level spell once with this trait, and you regain the
ability to cast it this way when you finish a long rest. Constitution
is your spellcasting ability for these spells.
You offer a comparable spell benefit that has wide application, though I think the Water Genasi may have the edge here. Maybe a +1 to Water.
Overall: somewhere in the low to mid twenties on that spread sheet, all said and done. I scored the Water Genasi as +7 and your Chaos Genasi at +6 (or +5, depends on how you judge the spell) using the spread sheet - for a 24 or a 23 - based on the "Guide" tab in the linked spread sheet. But that assessment may be off by a point or two. There's some subjectivity in how the scoring is assigned, and the 'value' of a given feature.
That supports "Not Unbalanced" as an assessment. Water is in the 'sweet spot' at 25 (range from 19-32 puts the median at about 25). Your is closer to a 24. You need not be concerned with unbalance on this, given the range of values used for scoring.