[verum ago]

Sunlight will kill bacteria. Fill water bottle and leave in sun. Water can also be boiled in a plastic water bottle over a fire.

The risk with cyanobacteria isn’t getting an infection, it’s the toxins they contain, many of which are UV resistant and survive boiling.
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In fact, since some are endotoxins (internal constituents of the cell itself) disinfecting cyanobacteria-contaminated water can actually make things worse by killing and breaking down the cells, thus freeing the endotoxins.

Short of some serious purification measures, cyanobacteria contaminated water is a hard no-go for human consumption.

[coaster123]

Thanks for the info.