A water extraction system, comprising: a hydrocarbon fuel tank storing a hydrocarbon fuel; a first water sorption unit and a second water sorption unit, wherein each of the first and second water sorption units comprises: a catalytic combustor configured to, in a desorption state, combust a hydrocarbon fuel mixture comprising the hydrocarbon fuel and ambient air from an environment to generate heat; a thermoelectric generator thermally coupled to the catalytic combustor, and configured to, in the desorption state, generate electricity from a first portion of the heat from the catalytic combustor; an adsorber comprising one or more surfaces configured for adsorption and desorption of water, and configured to: in an adsorption state, adsorb water from the ambient air; and in the desorption state, desorb the adsorbed water as vapor using a second portion of the heat from the catalytic combustor; one or more condensers configured to condense the vapor from the adsorber of each of the first and second water sorption units by cooling the vapor below a dew point; a pump configured to supply the ambient air as pressurized air to the adsorber in an adsorption state of the first and second water sorption units and the one or more condensers, wherein the pump is powered by the electricity generated by the thermoelectric generator; and a controller configured to operate the first and second water sorption units in alternating and opposite adsorption and desorption states to extract the water from the environment. a hydrocarbon fuel tank storing a hydrocarbon fuel; a first water sorption unit and a second water sorption unit, wherein each of the first and second water sorption units comprises: a catalytic combustor configured to, in a desorption state, combust a hydrocarbon fuel mixture comprising the hydrocarbon fuel and ambient air from an environment to generate heat; a thermoelectric generator thermally coupled to the catalytic combustor, and configured to, in the desorption state, generate electricity from a first portion of the heat from the catalytic combustor; an adsorber comprising one or more surfaces configured for adsorption and desorption of water, and configured to: in an adsorption state, adsorb water from the ambient air; and in the desorption state, desorb the adsorbed water as vapor using a second portion of the heat from the catalytic combustor; a catalytic combustor configured to, in a desorption state, combust a hydrocarbon fuel mixture comprising the hydrocarbon fuel and ambient air from an environment to generate heat; a thermoelectric generator thermally coupled to the catalytic combustor, and configured to, in the desorption state, generate electricity from a first portion of the heat from the catalytic combustor; an adsorber comprising one or more surfaces configured for adsorption and desorption of water, and configured to: in an adsorption state, adsorb water from the ambient air; and in the desorption state, desorb the adsorbed water as vapor using a second portion of the heat from the catalytic combustor; in an adsorption state, adsorb water from the ambient air; and in the desorption state, desorb the adsorbed water as vapor using a second portion of the heat from the catalytic combustor; one or more condensers configured to condense the vapor from the adsorber of each of the first and second water sorption units by cooling the vapor below a dew point; a pump configured to supply the ambient air as pressurized air to the adsorber in an adsorption state of the first and second water sorption units and the one or more condensers, wherein the pump is powered by the electricity generated by the thermoelectric generator; and a controller configured to operate the first and second water sorption units in alternating and opposite adsorption and desorption states to extract the water from the environment. <EOS>