A rapid, disposable, and cost-free solar steam generator device made of recyclable plastic bottles for the purification of seawater/wastewater by a solar evaporation method is demonstrated. This device utilizes the photothermal conversion of solar energy to heat using the mixture of two-dimensional TiO2 and Ti2O3 nanosheets synthesized via the probe ultrasound followed by coprecipitation. The water purification device showed a competitive maximum evaporation rate of 1.17 kg m−2 h−1 under one sun illumination (1.0 kW/m2) and showed a percentage efficiency of 79.9%. The real-world water samples of seawater and wastewater were demonstrated for fast purification within 1 min, and the resulting clean/drinking water from the device showed a significant improvement in their quality up to World Health Organization (WHO)–recommended drinking water limits.