Fluid-tight dilution bottle and cap

A fluid-tight vial comprising:

• (a) a substantially cylindrical container with an open end having a circumferential lip, a circumferential flange integral with said circumferential lip, a screw thread and a ratchet-toothed ring proximal to said open end;
• and
• (b) a cap adapted to engage said container's open end in fluid-tight fashion, said cap comprising a circumferential skirt, a hinge, a frangible strip and a flip-top, wherein the inner portion of said skirt has a screw thread capable of matingly engaging said screw thread of said open end of said container and a ratchet-toothed ring capable of lockingly engaging said ratchet-toothed ring of said open end of said container when said cap is threaded onto said container
• wherein said flip-top has an inner circumferential recess capable of non-threadedly engaging said circumferential flange to form a fluid-tight seal between said flange and said recess.