FIELD: process engineering.;SUBSTANCE: proposed straw has elongated tubular case with inner channel and lateral wall. Tube has first and second filters arranged at tube first and second ends, respectively. Said two filters retain preset amount of soluble active ingredients inside said channel but allow sucking liquid carrier via straw by mouth. Active gradient takes the shape of multiple solid granules. Each filter is produced by plugging, closing or contracting appropriate tube end to provide for one hole with size sufficiently small for retaining granules inside the tube but sufficiently large to allow fluid to flow.;EFFECT: accelerated addition of active gradient to liquid carrier when fluid is sucked through straw.;23 cl, 18 dwg
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