Here you can find the ration bottle 1 liter made of durable HDPE.
These can be divided into quantities with a waterproof pen.
For example, if you add 125 ml to the bottle and draw a line along the water level line, you have a good opportunity to determine the quantities taken. For example, you can divide a liter with 8 lines into 125 ml each.
The material HDPE is resistant to many chemicals.
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