The recent increase in Venezuelan migrants and refugees to Brazil has prompted a humanitarian response coordinated by multiple government agencies and inter/national organisations. This coordination effort sits under the umbrella of the Operation Welcome task force, in which the military is heavily involved. Situated in the northern state of Roraima, bordering Venezuela, this article explores one particular site of humanitarian care: a set of Water, Sanitation and Hygiene (WASH) facilities located in the capital city of Boa Vista. Here, I investigate the militaristic design and processes of the shower block, which is available to Venezuelan refugees and migrants who are living without adequate shelter. In doing so, this paper argues that the normalisation of militarism in humanitarian intervention (re)produces exclusion and precarity for those accessing spaces of care. By understanding the water infrastructure of the site as an infrastructure of containment, this research shines light on the everyday, often invisiblised implications of migration governance that occur at the micro-scale. In particular, it highlights the conditions of slow and symbolic violence that are embedded within the military-humanitarian response.