I will be traveling for a month and worried that my money tree might not survive without water. Any suggestions?

You are a lot more tolerant than I :-) Unless it had a strong emotional attachment, I would not bother with the time and effort involved in getting this plant into a healthy condition. Growth is very slow in winter and root rot is hard to come back from. And I do believe the appearance is due primarily to root rot, not the repotting. Just don't have room for ugly, half dead plants in my life :-) FWIW, I grow an epiphyllum that is not an attractive plant. In fact, my sister seldom fails to comment on its appearance every time she visits. It produces long and lanky growth and forms odd looking protrusions. But that is just the nature of the plant itself and the flowers, when produced, make up for it. OTOH, the pachira should be very full and lush looking.

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How does this happen? Ultimately, potted plants die because the grower has provided one or more cultural conditions that are beyond what the plant is genetically programmed to tolerate. In this case, soil conditions contributed to growth of a fungal pathogen which first infected the roots and moved systemically through the plant's vasculature to infect stem tissues and destroy the plant's ability to move water/nutrients efficiently. Chronic over-watering and/or a very high level of dissolved solids (salts) is/are almost undoubtedly at the root of the issue (no pun). The upper part of the trunk shows signs of rot, but the roots and base look fine. My assessment is not the same as yours. My intent isn't to make you feel diminished, but if I'm to be honest, the root system was virtually nonfunctional when the plant toppled from lack of enough roots to anchor the plant in the pot. Healthy root system: Is there anything I can do to salvage the tree? To say yes would be false encouragement. The plant is beyond salvation, and any attempt to propagate it will end in disappointment. I can't tell if the two remaining branches are dead or not. ......... But with the upper trunk rotted, I'd expect these branches won't be far behind.... I agree with that assessment. I'd skip the self-watering arrangement. Plants grown in these containers are disadvantaged due to the difficulty of maintaining a suitable air:moisture ratio in the medium; and, All salts from tapwater and fertilizer solutions remain in the grow medium. As they accrue, they begin to limit water/nutrient uptake, so your plant can die of thirst in a sea of plenty. This link to an Overview of Good Growing Practices will help you avoid the major issues we all face at some point on our journey to a green thumb. If you work toward gaining an understanding of the information it contains, it will make a conspicuous improvement in your ability to keep your plants in a high state of vitality (health). That means they will also LOOK like they're healthy, which makes you feel like you're a better provider, and you likely grow things to satisfy that 'nurturing bone' almost all of us have. Ask questions and don't be bashful about asking them. Al